// Uitklapbaar menu
function show_menu(item) {
	Effect.toggle(item, 'slide', { duration: 0.2 });

	for (var i = 0; i < ids.length; i++) {
		Element.hide(ids[i]);
	}

	for (var i = 0; i < ids.length; i++) {
		document.getElementById(ids[i] + "_icon").innerHTML = "&nbsp;";
	}	

	document.getElementById(item + "_icon").innerHTML = "<img src=\"/images/pijl_open.jpg\" width=\"11\" height=\"13\">";
}   

// Images preloaden
if (document.images) {
	preload_image_object = new Image();

	image_url = new Array();
	image_url[0] = "/images/pijl_open.jpg";
	
	var i = 0;

	for(i = 0; i <= 3; i++) {
		preload_image_object.src = image_url[i];
	}
}