navHover = function() {
	var lis = document.getElementById("navmenu").getElementsByTagName("LI");
	for (var i=0; i<lis.length; i++) {
		lis[i].onmouseover=function() {
			this.className+=" iehover";
		}
		lis[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" iehover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", navHover);

function display_tab(e,f){
	if(document.getElementById('tab1')){
		document.getElementById('tab1').style.display = "none";
		document.getElementById('li1').className = "none";
	}
	if(document.getElementById('tab2')){
		document.getElementById('tab2').style.display = "none";
		document.getElementById('li2').className = "none";
	}
	if(document.getElementById('tab3')){
		document.getElementById('tab3').style.display = "none";
		document.getElementById('li3').className = "none";
	}
	if(document.getElementById('tab4')){
		document.getElementById('tab4').style.display = "none";
		document.getElementById('li4').className = "none";
	}
	if(document.getElementById('tab5')){
		document.getElementById('tab5').style.display = "none";
		document.getElementById('li5').className = "none";
	}
	display_bloc(e);
	document.getElementById(f).className = "active";
}