function getElement(id) {
	return document.getElementById(id);
}

function showElement(element) {
	element.className="overlay_container";
}

function hideElement(element) {
	element.className="overlay_container_hidden";
}

function hideOverlays(exception) {
	for (var i = 0; i <= overlays.length; i++) {
		element = getElement(overlays[i]);
		if (element) {
			if ((exception) && (exception==overlays[i])) {
				showElement(element);
			} else {
				hideElement(element);
			}
		}
	}
}

function showOverlay(elid) {
	hideOverlays(elid);
}

var hovered = false;

function activate(name) {
	img = getElement("isometrie");
	if (name && (name!="")) {
		hovered = true;
		hideOverlays("overlay_"+name);
//		img.src="img/overlay_"+name+".gif";
	} else {
		hovered = false;
		hideOverlays();
		img.src=default_isometrie;
	}
}

function deactivate() {
	hovered = false;
	//setTimeout("deactivate_()",1000);
}

function deactivate_() {
	if ( ! hovered ) {
		activate();
	}
}

function popup(url) {
	xsize = "800";
	ysize = "440";
	window.open(url, "Panorama",  "width=" + xsize + "px, height=" + ysize + "px, scrollbars=yes");
	return false
}