spHover = function() {
    var sfEls = document.getElementsByTagName("SPAN");
    for (var i=0; i<sfEls.length; i++) 
    {
	if (sfEls[i].className=="toolDesc") 
        {
	    sfEls[i].onmouseover=function() {this.className=("toolDescHover");}
	    sfEls[i].onmouseout=function() {this.className=("toolDesc");}
	}
    }
}
if (window.attachEvent) window.attachEvent("onload", spHover);