function adjustHeights()
{

var content_height=document.getElementById('content').offsetHeight;
var left_height=document.getElementById('leftnav').offsetHeight;

document.getElementById('leftnav').style.height=Math.max(content_height, left_height)+"px";	
	
}
mainNavHover = function() {
	var sfEls = document.getElementById("navigation").getElementsByTagName("li");
	
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" over";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" over\\b"), "");
		}
	}
}
<!-- calls your IE patch to show the LI rollover hover-->
if (window.attachEvent) window.attachEvent("onload", mainNavHover);
//-->