flag = new Array(false,false,false,false,false);
nbMenu = 4;

function setFlag(id){
	var num = id.substr(8,1);
	var i = parseInt(num);
	flag[i] = true;
}
function resetFlag(){
	for(i=0;i<nbMenu;i++)
	{
		flag[i]=false;
	}
}
function dropDown(id){
	document.getElementById(id).style.visibility="visible";
	setFlag(id);
}
function collapse(){
	resetFlag();
	setTimeout("hideMenu();",50);
}
function hideMenu(){
	for(i=0;i<nbMenu;i++)
	{
		var objId = "dropmenu"+i;
		if(!flag[i]) document.getElementById(objId).style.visibility = "hidden";
	}
}