function openCentered( destURL, winName, width, height )
{
	var leftOffset = ( screen.width - width ) / 2;
	var topOffset = ( screen.height - height ) / 2;

	var winHandle = window.open( destURL, winName, 'statusbar=0,toolbar=0,width=' + width + ",height=" + height + ",top=" + topOffset + ",left=" + leftOffset + "'" );
}