function popup(mylink, windowname)
	{
	w = 650;
	h = 450;
	wleft = (screen.width - w) / 2;
	wtop = (screen.height - h) / 2;
	if (! window.focus)return true;
		var href;
	if (typeof(mylink) == 'string')
		href=mylink;
	else
		href=mylink.href;
		window.open(href, windowname, 'width=' + w + ', height=' + h + ', left=' + wleft + ', top=' + wtop + 'addressbar=yes, location=yes, menubar=yes, status=yes, toolbar=yes, scrollbars=yes, resizable=yes');
	return false;
}