function setLayer(){
	
	var obj = document.getElementById('rootTable');
	var tableLeft = 0;
	var tableTop = 0;
	if (obj.offsetParent) {
		tableLeft = obj.offsetLeft;
		tableTop = obj.offsetTop;
		while (obj = obj.offsetParent) {
			tableLeft += obj.offsetLeft;
			tableTop += obj.offsetTop;
		}
	}
	document.getElementById('layer1').style.left = tableLeft+290;
	document.getElementById('layer1').style.top = tableTop+390;
	document.getElementById('subMenu').style.left = tableLeft+570;
	document.getElementById('subMenu').style.top = tableTop+154;
}
function show_overlay(id){

	document.getElementById('selectedLayer').style.visibility='visible';
	document.getElementById('appartement').src="appartementen/appartement.php?id="+id;
	setLayerClose();
}

function hide_overlay(){
	
	parent.document.getElementById('selectedLayer').style.visibility='hidden';
}

function hideSubMenu(layer){
	
	document.getElementById(layer).style.visibility='hidden';
}

function showSubMenu(layer){
	
    document.getElementById(layer).style.visibility='visible';
}