function OpenWindow( url, windowName, w, h )
{
	l = ( screen.width - w ) / 2;
	t = ( screen.height - h ) / 2;

	params = "";
	params += "left=" + l;
	params += ",top=" + t;
	params += ",width=" + w;
	params += ",height=" + h;
	params += ",status=0,toolbar=0,location=0,menubar=0,resizable=1,scrollbars=1";

	window.open( url, windowName, params );
}