function popup(href, width, height, scrollbars){
	var scroll = (scrollbars)? 'yes' : 'no', 
		left = (screen.width - width) / 2, 
		top = ((screen.height - height) / 2) -50;
	
	var popup = window.open(href, "_blank", "scrollbars=" + scroll + ",width=" + width + ",height=" + height + ",left=" + left + ",top=" + top + "resizable=no,toolbar=no,directories=no,location=no,menubar=no,status=no");
	popup.moveTo(left, top);
	popup.focus();
	
	return false;
}