function openWindow(page, name, width, height) {
	scrollbars = 'no';
	t = screen.availHeight/2 - height/2;
	l = screen.availWidth/2 - width/2;
	window.open(page, name, 'toolbar=no,width='+width+',height='+height+',directories=no,status=no,scrollbars='+scrollbars+',resizable=no,menubar=no,top='+t+',left='+l);
}