function popup_open( url, name, width, height ) {
	window.open( url, typeof name == 'undefined' ? 'info' : name, 'width='+( parseInt( width ) > 0 ? width : 750 )+',height='+( parseInt( height ) > 0 ? height : 650 )+',scrollbars=yes,resizable=yes' );
	return false;
}