var inter = null;
var layerActive = null;

function clrT(id){
	if(layerActive!=null){
		if(layerActive!=id){
			nascondiLayer("sublevel_"+layerActive);
		}else{
			clearInterval(inter);
		}
	}
	var obj = document.getElementById("mainMenu"+id);
	obj.className = "mainMenuLinkActive";
	var altezza = obj.offsetHeight;


	document.getElementById("sublevel_"+id).style.left = getX(obj)+"px";

	document.getElementById("sublevel_"+id).style.top = getY(obj)+altezza+"px";

	document.getElementById("sublevel_"+id).style.visibility = "visible";
	layerActive = id;
}



function nascondiLayer(){
		document.getElementById("sublevel_"+layerActive).style.visibility = "hidden";
		document.getElementById("mainMenu"+layerActive).className = "mainMenuLinkNormal";
		clearInterval(inter);
}


function clsT(id){
	inter = setInterval("nascondiLayer()", 75);
}




function getY(obj){
	var y = 0;
	do
	{
		y += obj.offsetTop;
		obj = obj.offsetParent;
	}
	while (obj);
	return y;
}




function getX(obj){
	var x = 0;
	do
	{
		x += obj.offsetLeft;
		obj = obj.offsetParent;
	}
	while (obj);
	return x;
}