function openWindow(url) {

	var popup;
	var left 	= (screen.width - 800)/ 2;
	var top		= (screen.top - 680) / 2;

	popup = window.open(url, "popup", 'width=800,height=680,toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,left='+left+',top='+top+'');
	popup.focus();

}