function removeOverlay() {
	document.body.removeChild($('overlay_dialog'));
	return true;
}
function showWindow(url, title) {
	document.body.appendChild(Builder.node('div',{id:'overlay_dialog', className: 'overlay', style: 'width: 200px; height: 200px;'}));
	$('overlay_dialog').style.width = $('outer').getWidth()+'px'
	$('overlay_dialog').style.height = ($('outer').getHeight()+200)+'px';
	win = new Window({className: "dialog", title: title, width:600, height:400, destroyOnClose: true, recenterAuto:false, minimizable: false, maximizable: false, resizable: false, showEffect: Element.show, hideEffect: Element.hide}); 
	win.setAjaxContent(url, {method: 'get'})
	win.showCenter();
	win.setCloseCallback(removeOverlay);
	win.setZIndex(1234);
}