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+/* =================================================================================================
+ * TransMenu
+ * March, 2003
+ *
+ * Customizable multi-level animated DHTML menus with transparency.
+ *
+ * Copyright 2003-2004, Aaron Boodman (www.youngpup.net)
+ * =================================================================================================
+ * "Can I use this?"
+ *
+ * Use of this library is governed by the Creative Commons Attribution 2.0 License. You can check it
+ * out at: http://creativecommons.org/licenses/by/2.0/
+ *
+ * Basically: You may copy, distribute, and eat this code as you wish. But you must give me credit
+ * for writing it. You may not misrepresent yourself as the author of this code.
+ * =================================================================================================
+ * "It's kinda hard to read, though"
+ *
+ * The uncompressed, commented version of this script can be found at:
+ * http://youngpup.net/projects/transMenus
+ * =================================================================================================
+ * updates:
+ * 04.19.04 fixed cascade problem with menus nested greater than two levels.
+ * 12.23.03 added hideCurrent for menu actuators with no menus. renamed to TransMenu.
+ * 04.18.03 fixed render bug in IE 5.0 Mac by removing that browser from compatibility table ;)
+ * also made gecko check a little more strict by specifying build no.
+ * ============================================================================================== */
+
+
+
+//==================================================================================================
+// Configuration properties
+//==================================================================================================
+TransMenu.spacerGif = "themes/nervecenter/javascript/img/x.gif"; // path to a transparent spacer gif
+TransMenu.dingbatOn = "themes/nervecenter/javascript/img/submenu-on.gif"; // path to the active sub menu dingbat
+TransMenu.dingbatOff = "themes/nervecenter/javascript/img/submenu-off.gif"; // path to the inactive sub menu dingbat
+TransMenu.dingbatSize = 14; // size of the dingbat (square shape assumed)
+TransMenu.menuPadding = 5; // padding between menu border and items grid
+TransMenu.itemPadding = 3; // additional padding around each item
+TransMenu.shadowSize = 2; // size of shadow under menu
+TransMenu.shadowOffset = 3; // distance shadow should be offset from leading edge
+TransMenu.shadowColor = "#FF0000"; // color of shadow (transparency is set in CSS)
+TransMenu.shadowPng = "themes/nervecenter/javascript/img/grey-40.png"; // a PNG graphic to serve as the shadow for mac IE5
+TransMenu.backgroundColor = "#990000"; // color of the background (transparency set in CSS)
+TransMenu.backgroundPng = "themes/nervecenter/javascript/img/white-90.png"; // a PNG graphic to server as the background for mac IE5
+TransMenu.hideDelay = 1000; // number of milliseconds to wait before hiding a menu
+TransMenu.slideTime = 400; // number of milliseconds it takes to open and close a menu
+
+
+//==================================================================================================
+// Internal use properties
+//==================================================================================================
+TransMenu.reference = {topLeft:1,topRight:2,bottomLeft:3,bottomRight:4};
+TransMenu.direction = {down:1,right:2};
+TransMenu.registry = [];
+TransMenu._maxZ = 100;
+
+
+
+//==================================================================================================
+// Static methods
+//==================================================================================================
+// supporting win ie5+, mac ie5.1+ and gecko >= mozilla 1.0
+TransMenu.isSupported = function() {
+ var ua = navigator.userAgent.toLowerCase();
+ var pf = navigator.platform.toLowerCase();
+ var an = navigator.appName;
+ var r = false;
+
+ if (ua.indexOf("gecko") > -1 && navigator.productSub >= 20020605) r = true; // gecko >= moz 1.0
+ else if (an == "Microsoft Internet Explorer") {
+ if (document.getElementById) { // ie5.1+ mac,win
+ if (pf.indexOf("mac") == 0) {
+ r = /msie (\d(.\d*)?)/.test(ua) && Number(RegExp.$1) >= 5.1;
+ }
+ else r = true;
+ }
+ }
+
+ return r;
+}
+
+// call this in onload once menus have been created
+TransMenu.initialize = function() {
+ for (var i = 0, menu = null; menu = this.registry[i]; i++) {
+ menu.initialize();
+ }
+}
+
+// call this in document body to write out menu html
+TransMenu.renderAll = function() {
+ var aMenuHtml = [];
+ for (var i = 0, menu = null; menu = this.registry[i]; i++) {
+ aMenuHtml[i] = menu.toString();
+ }
+ document.write(aMenuHtml.join(""));
+}
+
+//==================================================================================================
+// TransMenu constructor (only called internally)
+//==================================================================================================
+// oActuator : The thing that causes the menu to be shown when it is mousedover. Either a
+// reference to an HTML element, or a TransMenuItem from an existing menu.
+// iDirection : The direction to slide out. One of TransMenu.direction.
+// iLeft : Left pixel offset of menu from actuator
+// iTop : Top pixel offset of menu from actuator
+// iReferencePoint : Corner of actuator to measure from. One of TransMenu.referencePoint.
+// parentMenuSet : Menuset this menu will be added to.
+//==================================================================================================
+function TransMenu(oActuator, iDirection, iLeft, iTop, iReferencePoint, parentMenuSet) {
+ // public methods
+ this.addItem = addItem;
+ this.addMenu = addMenu;
+ this.toString = toString;
+ this.initialize = initialize;
+ this.isOpen = false;
+ this.show = show;
+ this.hide = hide;
+ this.items = [];
+
+ // events
+ this.onactivate = new Function(); // when the menu starts to slide open
+ this.ondeactivate = new Function(); // when the menu finishes sliding closed
+ this.onmouseover = new Function(); // when the menu has been moused over
+ this.onqueue = new Function(); // hack .. when the menu sets a timer to be closed a little while in the future
+ this.ondequeue = new Function();
+
+ // initialization
+ this.index = TransMenu.registry.length;
+ TransMenu.registry[this.index] = this;
+
+ var id = "TransMenu" + this.index;
+ var contentHeight = null;
+ var contentWidth = null;
+ var childMenuSet = null;
+ var animating = false;
+ var childMenus = [];
+ var slideAccel = -1;
+ var elmCache = null;
+ var ready = false;
+ var _this = this;
+ var a = null;
+
+ var pos = iDirection == TransMenu.direction.down ? "top" : "left";
+ var dim = null;
+
+ // private and public method implimentations
+ function addItem(sText, sUrl) {
+ var item = new TransMenuItem(sText, sUrl, this);
+ item._index = this.items.length;
+ this.items[item._index] = item;
+ }
+
+ function addMenu(oMenuItem) {
+ if (!oMenuItem.parentMenu == this) throw new Error("Cannot add a menu here");
+
+ if (childMenuSet == null) childMenuSet = new TransMenuSet(TransMenu.direction.right, -5, 2, TransMenu.reference.topRight);
+
+ var m = childMenuSet.addMenu(oMenuItem);
+
+ childMenus[oMenuItem._index] = m;
+ m.onmouseover = child_mouseover;
+ m.ondeactivate = child_deactivate;
+ m.onqueue = child_queue;
+ m.ondequeue = child_dequeue;
+
+ return m;
+ }
+
+ function initialize() {
+ initCache();
+ initEvents();
+ initSize();
+ ready = true;
+ }
+
+ function show() {
+ //dbg_dump("show");
+ if (ready) {
+ _this.isOpen = true;
+ animating = true;
+ setContainerPos();
+ elmCache["clip"].style.visibility = "visible";
+ elmCache["clip"].style.zIndex = TransMenu._maxZ++;
+ //dbg_dump("maxZ: " + TransMenu._maxZ);
+ slideStart();
+ _this.onactivate();
+ }
+ }
+
+ function hide() {
+ if (ready) {
+ _this.isOpen = false;
+ animating = true;
+
+ for (var i = 0, item = null; item = elmCache.item[i]; i++)
+ dehighlight(item);
+
+ if (childMenuSet) childMenuSet.hide();
+
+ slideStart();
+ _this.ondeactivate();
+ }
+ }
+
+ function setContainerPos() {
+ var sub = oActuator.constructor == TransMenuItem;
+ var act = sub ? oActuator.parentMenu.elmCache["item"][oActuator._index] : oActuator;
+ var el = act;
+
+ var x = 0;
+ var y = 0;
+
+
+ var minX = 0;
+ var maxX = (window.innerWidth ? window.innerWidth : document.body.clientWidth) - parseInt(elmCache["clip"].style.width);
+ var minY = 0;
+ var maxY = (window.innerHeight ? window.innerHeight : document.body.clientHeight) - parseInt(elmCache["clip"].style.height);
+
+ // add up all offsets... subtract any scroll offset
+ while (sub ? el.parentNode.className.indexOf("transMenu") == -1 : el.offsetParent) {
+ x += el.offsetLeft;
+ y += el.offsetTop;
+
+ if (el.scrollLeft) x -= el.scrollLeft;
+ if (el.scrollTop) y -= el.scrollTop;
+
+ el = el.offsetParent;
+ }
+
+ if (oActuator.constructor == TransMenuItem) {
+ x += parseInt(el.parentNode.style.left);
+ y += parseInt(el.parentNode.style.top);
+ }
+
+ switch (iReferencePoint) {
+ case TransMenu.reference.topLeft:
+ break;
+ case TransMenu.reference.topRight:
+ x += act.offsetWidth;
+ break;
+ case TransMenu.reference.bottomLeft:
+ y += act.offsetHeight;
+ break;
+ case TransMenu.reference.bottomRight:
+ x += act.offsetWidth;
+ y += act.offsetHeight;
+ break;
+ }
+
+ x += iLeft;
+ y += iTop;
+
+ x = Math.max(Math.min(x, maxX), minX);
+ y = Math.max(Math.min(y, maxY), minY);
+
+ elmCache["clip"].style.left = x + "px";
+ elmCache["clip"].style.top = y + "px";
+ }
+
+ function slideStart() {
+ var x0 = parseInt(elmCache["content"].style[pos]);
+ var x1 = _this.isOpen ? 0 : -dim;
+
+ if (a != null) a.stop();
+ a = new Accelimation(x0, x1, TransMenu.slideTime, slideAccel);
+
+ a.onframe = slideFrame;
+ a.onend = slideEnd;
+
+ a.start();
+ }
+
+ function slideFrame(x) {
+ elmCache["content"].style[pos] = x + "px";
+ }
+
+ function slideEnd() {
+ if (!_this.isOpen) elmCache["clip"].style.visibility = "hidden";
+ animating = false;
+ }
+
+ function initSize() {
+ // everything is based off the size of the items table...
+ var ow = elmCache["items"].offsetWidth;
+ var oh = elmCache["items"].offsetHeight;
+ var ua = navigator.userAgent.toLowerCase();
+
+ // clipping container should be ow/oh + the size of the shadow
+ elmCache["clip"].style.width = ow + TransMenu.shadowSize + 2 + "px";
+ elmCache["clip"].style.height = oh + TransMenu.shadowSize + 2 + "px";
+
+ // same with content...
+ elmCache["content"].style.width = ow + TransMenu.shadowSize + "px";
+ elmCache["content"].style.height = oh + TransMenu.shadowSize + "px";
+
+ contentHeight = oh + TransMenu.shadowSize;
+ contentWidth = ow + TransMenu.shadowSize;
+
+ dim = iDirection == TransMenu.direction.down ? contentHeight : contentWidth;
+
+ // set initially closed
+ elmCache["content"].style[pos] = -dim - TransMenu.shadowSize + "px";
+ elmCache["clip"].style.visibility = "hidden";
+
+ // if *not* mac/ie 5
+ if (ua.indexOf("mac") == -1 || ua.indexOf("gecko") > -1) {
+ // set background div to offset size
+ elmCache["background"].style.width = ow + "px";
+ elmCache["background"].style.height = oh + "px";
+ elmCache["background"].style.backgroundColor = TransMenu.backgroundColor;
+
+ // shadow left starts at offset left and is offsetHeight pixels high
+ elmCache["shadowRight"].style.left = ow + "px";
+ elmCache["shadowRight"].style.height = oh - (TransMenu.shadowOffset - TransMenu.shadowSize) + "px";
+ elmCache["shadowRight"].style.backgroundColor = TransMenu.shadowColor;
+
+ // shadow bottom starts at offset height and is offsetWidth - shadowOffset
+ // pixels wide (we don't want the bottom and right shadows to overlap or we
+ // get an extra bright bottom-right corner)
+ elmCache["shadowBottom"].style.top = oh + "px";
+ elmCache["shadowBottom"].style.width = ow - TransMenu.shadowOffset + "px";
+ elmCache["shadowBottom"].style.backgroundColor = TransMenu.shadowColor;
+ }
+ // mac ie is a little different because we use a PNG for the transparency
+ else {
+ // set background div to offset size
+ elmCache["background"].firstChild.src = TransMenu.backgroundPng;
+ elmCache["background"].firstChild.width = ow;
+ elmCache["background"].firstChild.height = oh;
+
+ // shadow left starts at offset left and is offsetHeight pixels high
+ elmCache["shadowRight"].firstChild.src = TransMenu.shadowPng;
+ elmCache["shadowRight"].style.left = ow + "px";
+ elmCache["shadowRight"].firstChild.width = TransMenu.shadowSize;
+ elmCache["shadowRight"].firstChild.height = oh - (TransMenu.shadowOffset - TransMenu.shadowSize);
+
+ // shadow bottom starts at offset height and is offsetWidth - shadowOffset
+ // pixels wide (we don't want the bottom and right shadows to overlap or we
+ // get an extra bright bottom-right corner)
+ elmCache["shadowBottom"].firstChild.src = TransMenu.shadowPng;
+ elmCache["shadowBottom"].style.top = oh + "px";
+ elmCache["shadowBottom"].firstChild.height = TransMenu.shadowSize;
+ elmCache["shadowBottom"].firstChild.width = ow - TransMenu.shadowOffset;
+ }
+ }
+
+ function initCache() {
+ var menu = document.getElementById(id);
+ var all = menu.all ? menu.all : menu.getElementsByTagName("*"); // IE/win doesn't support * syntax, but does have the document.all thing
+
+ elmCache = {};
+ elmCache["clip"] = menu;
+ elmCache["item"] = [];
+
+ for (var i = 0, elm = null; elm = all[i]; i++) {
+ switch (elm.className) {
+ case "items":
+ case "content":
+ case "background":
+ case "shadowRight":
+ case "shadowBottom":
+ elmCache[elm.className] = elm;
+ break;
+ case "item":
+ elm._index = elmCache["item"].length;
+ elmCache["item"][elm._index] = elm;
+ break;
+ }
+ }
+
+ // hack!
+ _this.elmCache = elmCache;
+ }
+
+ function initEvents() {
+ // hook item mouseover
+ for (var i = 0, item = null; item = elmCache.item[i]; i++) {
+ item.onmouseover = item_mouseover;
+ item.onmouseout = item_mouseout;
+ item.onclick = item_click;
+ }
+
+ // hook actuation
+ if (typeof oActuator.tagName != "undefined") {
+ oActuator.onmouseover = actuator_mouseover;
+ oActuator.onmouseout = actuator_mouseout;
+ }
+
+ // hook menu mouseover
+ elmCache["content"].onmouseover = content_mouseover;
+ elmCache["content"].onmouseout = content_mouseout;
+ }
+
+ function highlight(oRow) {
+ oRow.className = "item hover";
+ if (childMenus[oRow._index])
+ oRow.lastChild.firstChild.src = TransMenu.dingbatOn;
+ }
+
+ function dehighlight(oRow) {
+ oRow.className = "item";
+ if (childMenus[oRow._index])
+ oRow.lastChild.firstChild.src = TransMenu.dingbatOff;
+ }
+
+ function item_mouseover() {
+ if (!animating) {
+ highlight(this);
+
+ if (childMenus[this._index])
+ childMenuSet.showMenu(childMenus[this._index]);
+ else if (childMenuSet) childMenuSet.hide();
+ }
+ }
+
+ function item_mouseout() {
+ if (!animating) {
+ if (childMenus[this._index])
+ childMenuSet.hideMenu(childMenus[this._index]);
+ else // otherwise child_deactivate will do this
+ dehighlight(this);
+ }
+ }
+
+ function item_click() {
+ if (!animating) {
+ if (_this.items[this._index].url)
+ location.href = _this.items[this._index].url;
+ }
+ }
+
+ function actuator_mouseover() {
+ parentMenuSet.showMenu(_this);
+ }
+
+ function actuator_mouseout() {
+ parentMenuSet.hideMenu(_this);
+ }
+
+ function content_mouseover() {
+ if (!animating) {
+ parentMenuSet.showMenu(_this);
+ _this.onmouseover();
+ }
+ }
+
+ function content_mouseout() {
+ if (!animating) {
+ parentMenuSet.hideMenu(_this);
+ }
+ }
+
+ function child_mouseover() {
+ if (!animating) {
+ parentMenuSet.showMenu(_this);
+ }
+ }
+
+ function child_deactivate() {
+ for (var i = 0; i < childMenus.length; i++) {
+ if (childMenus[i] == this) {
+ dehighlight(elmCache["item"][i]);
+ break;
+ }
+ }
+ }
+
+ function child_queue() {
+ parentMenuSet.hideMenu(_this);
+ }
+
+ function child_dequeue() {
+ parentMenuSet.showMenu(_this);
+ }
+
+ function toString() {
+ var aHtml = [];
+ var sClassName = "transMenu" + (oActuator.constructor != TransMenuItem ? " top" : "");
+
+ for (var i = 0, item = null; item = this.items[i]; i++) {
+ aHtml[i] = item.toString(childMenus[i]);
+ }
+
+ return '<div id="' + id + '" class="' + sClassName + '">' +
+ '<div class="content"><table class="items" cellpadding="0" cellspacing="0" border="0">' +
+ '<tr><td colspan="2"><img src="' + TransMenu.spacerGif + '" width="1" height="' + TransMenu.menuPadding + '"></td></tr>' +
+ aHtml.join('') +
+ '<tr><td colspan="2"><img src="' + TransMenu.spacerGif + '" width="1" height="' + TransMenu.menuPadding + '"></td></tr></table>' +
+ '<div class="shadowBottom"><img src="' + TransMenu.spacerGif + '" width="1" height="1"></div>' +
+ '<div class="shadowRight"><img src="' + TransMenu.spacerGif + '" width="1" height="1"></div>' +
+ '<div class="background"><img src="' + TransMenu.spacerGif + '" width="1" height="1"></div>' +
+ '</div></div>';
+ }
+}
+
+
+//==================================================================================================
+// TransMenuSet
+//==================================================================================================
+// iDirection : The direction to slide out. One of TransMenu.direction.
+// iLeft : Left pixel offset of menus from actuator
+// iTop : Top pixel offset of menus from actuator
+// iReferencePoint : Corner of actuator to measure from. One of TransMenu.referencePoint.
+//==================================================================================================
+TransMenuSet.registry = [];
+
+function TransMenuSet(iDirection, iLeft, iTop, iReferencePoint) {
+ // public methods
+ this.addMenu = addMenu;
+ this.showMenu = showMenu;
+ this.hideMenu = hideMenu;
+ this.hide = hide;
+ this.hideCurrent = hideCurrent;
+
+ // initialization
+ var menus = [];
+ var _this = this;
+ var current = null;
+
+ this.index = TransMenuSet.registry.length;
+ TransMenuSet.registry[this.index] = this;
+
+ // method implimentations...
+ function addMenu(oActuator) {
+ var m = new TransMenu(oActuator, iDirection, iLeft, iTop, iReferencePoint, this);
+ menus[menus.length] = m;
+ return m;
+ }
+
+ function showMenu(oMenu) {
+ if (oMenu != current) {
+ // close currently open menu
+ if (current != null) hide(current);
+
+ // set current menu to this one
+ current = oMenu;
+
+ // if this menu is closed, open it
+ oMenu.show();
+ }
+ else {
+ // hide pending calls to close this menu
+ cancelHide(oMenu);
+ }
+ }
+
+ function hideMenu(oMenu) {
+ //dbg_dump("hideMenu a " + oMenu.index);
+ if (current == oMenu && oMenu.isOpen) {
+ //dbg_dump("hideMenu b " + oMenu.index);
+ if (!oMenu.hideTimer) scheduleHide(oMenu);
+ }
+ }
+
+ function scheduleHide(oMenu) {
+ //dbg_dump("scheduleHide " + oMenu.index);
+ oMenu.onqueue();
+ oMenu.hideTimer = window.setTimeout("TransMenuSet.registry[" + _this.index + "].hide(TransMenu.registry[" + oMenu.index + "])", TransMenu.hideDelay);
+ }
+
+ function cancelHide(oMenu) {
+ //dbg_dump("cancelHide " + oMenu.index);
+ if (oMenu.hideTimer) {
+ oMenu.ondequeue();
+ window.clearTimeout(oMenu.hideTimer);
+ oMenu.hideTimer = null;
+ }
+ }
+
+ function hide(oMenu) {
+ if (!oMenu && current) oMenu = current;
+
+ if (oMenu && current == oMenu && oMenu.isOpen) {
+ hideCurrent();
+ }
+ }
+
+ function hideCurrent() {
+ if (null != current) {
+ cancelHide(current);
+ current.hideTimer = null;
+ current.hide();
+ current = null;
+ }
+ }
+}
+
+//==================================================================================================
+// TransMenuItem (internal)
+// represents an item in a dropdown
+//==================================================================================================
+// sText : The item display text
+// sUrl : URL to load when the item is clicked
+// oParent : Menu this item is a part of
+//==================================================================================================
+function TransMenuItem(sText, sUrl, oParent) {
+ this.toString = toString;
+ this.text = sText;
+ this.url = sUrl;
+ this.parentMenu = oParent;
+
+ function toString(bDingbat) {
+ var sDingbat = bDingbat ? TransMenu.dingbatOff : TransMenu.spacerGif;
+ var iEdgePadding = TransMenu.itemPadding + TransMenu.menuPadding;
+ var sPaddingLeft = "padding:" + TransMenu.itemPadding + "px; padding-left:" + iEdgePadding + "px;"
+ var sPaddingRight = "padding:" + TransMenu.itemPadding + "px; padding-right:" + iEdgePadding + "px;"
+
+ return '<tr class="item"><td nowrap style="' + sPaddingLeft + '">' +
+ sText + '</td><td width="14" style="' + sPaddingRight + '">' +
+ '<img src="' + sDingbat + '" width="14" height="14"></td></tr>';
+ }
+}
+
+
+
+
+
+
+//=====================================================================
+// Accel[erated] [an]imation object
+// change a property of an object over time in an accelerated fashion
+//=====================================================================
+// obj : reference to the object whose property you'd like to animate
+// prop : property you would like to change eg: "left"
+// to : final value of prop
+// time : time the animation should take to run
+// zip : optional. specify the zippiness of the acceleration. pick a
+// number between -1 and 1 where -1 is full decelerated, 1 is
+// full accelerated, and 0 is linear (no acceleration). default
+// is 0.
+// unit : optional. specify the units for use with prop. default is
+// "px".
+//=====================================================================
+// bezier functions lifted from the lib_animation.js file in the
+// 13th Parallel API. www.13thparallel.org
+//=====================================================================
+
+function Accelimation(from, to, time, zip) {
+ if (typeof zip == "undefined") zip = 0;
+ if (typeof unit == "undefined") unit = "px";
+
+ this.x0 = from;
+ this.x1 = to;
+ this.dt = time;
+ this.zip = -zip;
+ this.unit = unit;
+ this.timer = null;
+ this.onend = new Function();
+ this.onframe = new Function();
+}
+
+
+
+//=====================================================================
+// public methods
+//=====================================================================
+
+// after you create an accelimation, you call this to start it-a runnin'
+Accelimation.prototype.start = function() {
+ this.t0 = new Date().getTime();
+ this.t1 = this.t0 + this.dt;
+ var dx = this.x1 - this.x0;
+ this.c1 = this.x0 + ((1 + this.zip) * dx / 3);
+ this.c2 = this.x0 + ((2 + this.zip) * dx / 3);
+ Accelimation._add(this);
+}
+
+// and if you need to stop it early for some reason...
+Accelimation.prototype.stop = function() {
+ Accelimation._remove(this);
+}
+
+
+
+//=====================================================================
+// private methods
+//=====================================================================
+
+// paints one frame. gets called by Accelimation._paintAll.
+Accelimation.prototype._paint = function(time) {
+ if (time < this.t1) {
+ var elapsed = time - this.t0;
+ this.onframe(Accelimation._getBezier(elapsed/this.dt,this.x0,this.x1,this.c1,this.c2));
+ }
+ else this._end();
+}
+
+// ends the animation
+Accelimation.prototype._end = function() {
+ Accelimation._remove(this);
+ this.onframe(this.x1);
+ this.onend();
+}
+
+
+
+
+//=====================================================================
+// static methods (all private)
+//=====================================================================
+
+// add a function to the list of ones to call periodically
+Accelimation._add = function(o) {
+ var index = this.instances.length;
+ this.instances[index] = o;
+ // if this is the first one, start the engine
+ if (this.instances.length == 1) {
+ this.timerID = window.setInterval("Accelimation._paintAll()", this.targetRes);
+ }
+}
+
+// remove a function from the list
+Accelimation._remove = function(o) {
+ for (var i = 0; i < this.instances.length; i++) {
+ if (o == this.instances[i]) {
+ this.instances = this.instances.slice(0,i).concat( this.instances.slice(i+1) );
+ break;
+ }
+ }
+ // if that was the last one, stop the engine
+ if (this.instances.length == 0) {
+ window.clearInterval(this.timerID);
+ this.timerID = null;
+ }
+}
+
+// "engine" - call each function in the list every so often
+Accelimation._paintAll = function() {
+ var now = new Date().getTime();
+ for (var i = 0; i < this.instances.length; i++) {
+ this.instances[i]._paint(now);
+ }
+}
+
+
+// Bezier functions:
+Accelimation._B1 = function(t) { return t*t*t }
+Accelimation._B2 = function(t) { return 3*t*t*(1-t) }
+Accelimation._B3 = function(t) { return 3*t*(1-t)*(1-t) }
+Accelimation._B4 = function(t) { return (1-t)*(1-t)*(1-t) }
+
+
+//Finds the coordinates of a point at a certain stage through a bezier curve
+Accelimation._getBezier = function(percent,startPos,endPos,control1,control2) {
+ return endPos * this._B1(percent) + control2 * this._B2(percent) + control1 * this._B3(percent) + startPos * this._B4(percent);
+}
+
+
+//=====================================================================
+// static properties
+//=====================================================================
+
+Accelimation.instances = [];
+Accelimation.targetRes = 10;
+Accelimation.timerID = null;
+
+
+//=====================================================================
+// IE win memory cleanup
+//=====================================================================
+
+if (window.attachEvent) {
+ var cearElementProps = [
+ 'data',
+ 'onmouseover',
+ 'onmouseout',
+ 'onmousedown',
+ 'onmouseup',
+ 'ondblclick',
+ 'onclick',
+ 'onselectstart',
+ 'oncontextmenu'
+ ];
+
+ window.attachEvent("onunload", function() {
+ var el;
+ for(var d = document.all.length;d--;){
+ el = document.all[d];
+ for(var c = cearElementProps.length;c--;){
+ el[cearElementProps[c]] = null;
+ }
+ }
+ });
+} \ No newline at end of file
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