function popWindow( aurl, awid, ahgt ) {

	var x = Math.round( (screen.width / 2)  - (awid / 2) );
	var y = Math.round( (screen.height / 3) - (ahgt / 2) );		

	var newWindow = window.open( aurl, '_blank',
			'top='+y+',left='+ x+',width='+awid+',height='+ahgt+',scrollbars=yes,status=no,resizable=no,directories=no' );
	return false;
}