/**
 * Display a popup windows with a specified url, width and height in the center of the screen
 */
function subWinRcpt(urlname,width,height,popupName)
{
	var x = Math.round((screen.availWidth - width) / 2);
	var y = Math.round((screen.availHeight - height) / 2);
	popUp = window.open(urlname, popupName,'left=' + x + ',' + 'top=' + y + ',' + 'width='+width+',height='+height+',resize=on,scrollbars=no,toolbars=no,menubars=no,location=no');
	popUp.focus();
}