var newwindow;
function popwindow(url)
{
	var winl = (screen.width-650)/2;
	var wint = (screen.height-600)/2;
	newwindow=window.open(url,'name','height=600,width=650, scrollbars=yes, resizable=no, toolbar=no, status=no, top='+wint+', left='+winl+'');
	if (window.focus) {newwindow.focus()}
}