// 
// Layers manipulation
//

var cur_lyr;
var vis=false;

function toggleLayer(id){
	vis = getElemRefs(id).css.visibility;
	if(vis == "visible") hideLayer(id);
	else showLayer(id);
}

function swapLayers(id) {
	hideLayer(cur_lyr);
	cur_lyr2=cur_lyr;
	cur_lyr = id;
	if (vis==false || cur_lyr2!=id){
		showLayer(id);vis=true;
		createCookie("menu_expand", id);
	}
	else{
		vis=false;
		createCookie("menu_expand", "");
	}
}
function showLayer(id) {
	var lyr = getElemRefs(id);
	if (lyr && lyr.css) lyr.css.visibility = "visible";
	if (lyr && lyr.css) lyr.css.position = "";
}

function hideLayer(id) {
	var lyr = getElemRefs(id);
	//vis=false;
	if (lyr && lyr.css) lyr.css.visibility = "hidden";
	if (lyr && lyr.css) lyr.css.position = "absolute";
}

function getElemRefs(id) {
	var el = (document.getElementById)? document.getElementById(id): (document.all)? document.all[id]: (document.layers)? document.layers[id]: null;
	if (el) el.css = (el.style)? el.style: el;
	return el;
}