var per=0;
var hidetimer;
var img=false;

function hideMenus(){
	clearHideTimer();
	for (i = 0; (document.getElementById("menu-tbl").getElementsByTagName("table").item(i)); i++) {	
		document.getElementById("menu-tbl").getElementsByTagName("table").item(i).style.display = "none";
		img=false;
}
}

function hideTimer(){
	if (img==false) hidetimer=setTimeout('hideMenus()', per);
}

function clearHideTimer(){
	clearTimeout(hidetimer);
}

function showLayer(name){
	hideMenus();
	if(document.getElementById(name)){
	document.getElementById(name).style.display = "block";	
	img=true;
	}
}