function changeIt(style1){
	document.getElementById(style1).className="navOver";
	}
	function changeBack(style1){
	document.getElementById(style1).className="navSecond";
	}
	function showIt(style2){
	var pgwd=document.body.offsetWidth
	var pght=document.body.offsetHeight;
	var figure=(pgwd-760)/2 + 185	
		var nome=navigator.userAgent;
		brow=nome.search("Mac");
		if (brow != -1){
		var macFig = figure + 10
			/*if(style2="keyserv"){
			var macKeyHt = "425"
			document.getElementById(style2).style.top=macKeyHt;
			}*/
			if(style2="casehist"){
			var macCaseHt = "506"
			document.getElementById(style2).style.top=macCaseHt;
			}
			document.getElementById(style2).style.left=macFig;
	}
	
	document.getElementById(style2).style.left=figure;
	document.getElementById(style2).style.visibility="visible";
	}
	function showBack(style2){
	document.getElementById(style2).style.visibility="hidden";
	}