in js I have written following line of code to navigate back , home pages. this code works fine upto version 8 but not working in version 9 and above

<a href="#" onClick="goBack();" >Back to Previous</a> 

function goBack(){
 
 		//Disabled the action of the link after first click to avoid repeated click events-Sreejesh
 		//once the action is compleated It  will be activated by the function 'doCommonLoad' in commonfunctions.js   		
 		
 		objLinks = document.links;
 		alert(objLinks.length);
			for(i=0;i<objLinks.length;i++){
				alert(objLinks[i]);
				if(objLinks[i].onclick.toString().indexOf("goBack")>0){
					objLinks[i].style.color="grey";
					objLinks[i].removeAttribute('onClick');
				}
			}
		
 
    if(taskList == true){
         if (secondFrame == "tasklistframe") {
                    hideFrame("inboxframe");
                    minimizeFrame("tasklistframe");
					
               } else {
                    hideFrame("tasklistframe");
                    minimizeFrame("inboxframe");
					}
				  			 	
            }
   
    // if(twoFrames = false)
	// {
	// maximize('maincontentframe');
	// }
	if(document.getElementById("statusbar").style.display == 'none')
	{
	document.getElementById("statusbar").style.display = 'block';
	}
	document.getElementById("mainMin").style.visibility = "visible"
	
	parent.document.getElementById("hiddenframe").src="hidden.jsp?action=MENU_GO_BACK";
	 }

it gives error in js as -- objLinks[i].onclick is null when I click on the link

Modified October 22, 2012 7:08:56 AM PDT by cor-el