var newwin

function pop720_500(url_print)
{
	if (newwin == null)
		newwin = window.open(url_print,null,'scrollbars=yes,toolbar=no,resize=no,menubar=no,width=720,height=500');
	else {
		if (!newwin.closed)
			newwin.close();
		newwin = window.open(url_print,null,'scrollbars=yes,toolbar=no,resize=no,menubar=no,width=720,height=500');
	}
}