Avoid errors when a non-existent element is called by a function

Submitted-by: Manoel Carvalho

1 files changed, 24 insertions, 18 deletions

diff --git a/usr/local/www/javascript/ticker.js b/usr/local/www/javascript/ticker.js
index 77d3c63..8297c10 100755
--- a/usr/local/www/javascript/ticker.js
+++ b/usr/local/www/javascript/ticker.js
@@ -10,33 +10,39 @@ var copyspeed=speed;
 var pausespeed=(pauseit==0)? copyspeed: 0;
 var iedom=document.all||document.getElementById;
 
-if (iedom)
+if (iedom&&content)
 	document.write('<span id="marquee-container">'+content+'</span>');
 
 var actualwidth='';
 var scroller;
 
-if (window.addEventListener)
-	window.addEventListener("load", populatescroller, false);
-else if (window.attachEvent)
-	window.attachEvent("onload", populatescroller);
-else if (document.all || document.getElementById)
-	window.onload=populatescroller;
+try {
+    if (window.addEventListener)
+	    window.addEventListener("load", populatescroller, false);
+    else if (window.attachEvent)
+	    window.attachEvent("onload", populatescroller);
+    else if (document.all || document.getElementById)
+	    window.onload=populatescroller;
+}catch(e){}
 
 function populatescroller(){
-	scroller=document.getElementById? document.getElementById("scroller") : document.all.scroller;
-	scroller.style.left=parseInt(width)+8+"px";
-	scroller.innerHTML=content;
-	document.getElementById("marquee-text");
-	actualwidth=document.all? document.getElementById("marquee-text").offsetWidth : document.getElementById("marquee-text").offsetWidth;
-	lefttime=setInterval("scrollmarquee()",20);
+    try {
+	    scroller=document.getElementById? document.getElementById("scroller") : document.all.scroller;
+	    scroller.style.left=parseInt(width)+8+"px";
+	    scroller.innerHTML=content;
+	    document.getElementById("marquee-text");
+	    actualwidth=document.all? document.getElementById("marquee-text").offsetWidth : document.getElementById("marquee-text").offsetWidth;
+	    lefttime=setInterval("scrollmarquee()",20);
+	}catch(e){}
 }
 
 function scrollmarquee(){
-	if (parseInt(scroller.style.left)>(actualwidth*(-1)+8))
-		scroller.style.left=parseInt(scroller.style.left)-copyspeed+"px";
-	else
-		scroller.style.left=parseInt(width)+8+"px";
+    try {
+	    if (parseInt(scroller.style.left)>(actualwidth*(-1)+8))
+		    scroller.style.left=parseInt(scroller.style.left)-copyspeed+"px";
+	    else
+		    scroller.style.left=parseInt(width)+8+"px";
+	}catch(e){}
 }
 
 if (iedom){
@@ -47,4 +53,4 @@ if (iedom){
 	document.write('</td></table>');
 }
 
-//-->
\ No newline at end of file
+//-->