function getInternetExplorerVersion() {
	var rv = -1;
	if (navigator.appName == 'Microsoft Internet Explorer') {
		var ua = navigator.userAgent;
		var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
		if(re.exec(ua) != null) rv = parseFloat( RegExp.$1 );
	}
	return rv;
}

function ouvreMenu(event) {
	//document.getElementById("sousMenu").style.display = "block";
	var event = event || window.event; 
	var target = event.target || event.srcElement;
	if(target.id=="menu2") {
		document.getElementById("sousMenu2").style.display = "block";
		document.getElementById("sousMenu3").style.display = "none";
	}
	else if(target.id=="menu3") {
		document.getElementById("sousMenu3").style.display = "block";
		document.getElementById("sousMenu2").style.display = "none";
	}
	//alert(target.id);
}
function fermeMenu(id) {
	document.getElementById("sousMenu3").style.display = "none";
	document.getElementById("sousMenu2").style.display = "none";
	//document.getElementById("sousMenu").style.display = "none";
	//alert(id);
}

function initMenu() {
	if(getInternetExplorerVersion()<=6 && getInternetExplorerVersion()>0) {
		document.getElementById("menu1").attachEvent("onmouseover", fermeMenu);
		document.getElementById("menu2").attachEvent("onmouseover", ouvreMenu);
		document.getElementById("menu3").attachEvent("onmouseover", ouvreMenu);
		document.getElementById("menu4").attachEvent("onmouseover", fermeMenu);
		document.getElementById("menu5").attachEvent("onmouseover", fermeMenu);
		document.getElementById("menu6").attachEvent("onmouseover", fermeMenu);
		document.getElementById("menu7").attachEvent("onmouseover", fermeMenu);
	}
}

window.onload = initMenu;