function openPopup_wh(url,wname,w,h) {
	cw = Math.floor((screen.availWidth-w)/2);
	ch = Math.floor((screen.availHeight-h)/2);
	popupwdw = window.open(url,wname,'top='+ch+',left='+cw+',width='+w+',height='+h+',scrollbars=no,resizable=yes,toolbar=no,status=no');
	popupwdw.focus();
}
function openPopup_wh_rel(url,wname,w_min,h_min) {
	w = Math.floor(screen.availWidth*0.5);
	h = Math.floor(screen.availHeight*0.5);
	if ( w < w_min ) w=w_min;
	if ( h < h_min ) h=h_min;
	cw = Math.floor((screen.availWidth-w)/2);
	ch = Math.floor((screen.availHeight-h)/2);
	popupwdw = window.open(url,wname,'top='+ch+',left='+cw+',width='+w+',height='+h+',scrollbars=no,resizable=yes,toolbar=no,status=no');
	popupwdw.focus();
}