var popUpWin=0;
function popUpWindow(URLStr, xx, yy) {
	posX = (screen.width / 2) - (xx / 2);
	posY = (screen.height / 2) - (yy / 2);
	if(popUpWin) {
		if(!popUpWin.closed) popUpWin.close();
	}
	popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,menubar=no,location=no,scrollbar=no,resizable=no,width='+xx+',height='+yy+',layerx=0,layery=0,top='+posY+',left='+posX+',alwaysRaised=yes');
}