var popupwin = null;
function popup(loc,ww,hh) {
var mywidth = (ww + 0);
var myheight = (hh + 0);
var myspecs = "'menubar=no,status=no,resizable=yes,location=no,titlebar=no,toolbar=no,scrollbars=yes,top=0,left=0left=0,top=0,width=" + mywidth + ",height=" + myheight + "'";
if (popupwin == null || popupwin.closed) {popupwin = window.open (loc, 'popupwin', myspecs);
} else {popupwin.focus();popupwin.location.href = loc;
}
}