function openWindow ( URL, NAME, WIDTH, HEIGHT, CENTERED ) {
	var LEFT	= Math.floor( ( screen.width - WIDTH ) / 2 );
	var TOP		= Math.floor( ( screen.height - HEIGHT ) / 2 );
	var PROPS	= "height=" + HEIGHT + ",width=" + WIDTH + ",toolbar=no,menubar=no,location=no,scrollbars=yes,resizable=yes,status=no";

	if ( CENTERED )
	{
		PROPS = "top=" + TOP + ",left=" + LEFT + "," + PROPS;
	}

	win = window.open ( URL, NAME, PROPS );

	if ( parseInt( navigator.appVersion ) >= 4 ) {
		win.window.focus();
	}

	return false;
}