function popup (_url, _title, _width, _height, _options)
{
	if (_options == '') {
		options = 'location=no,menubar=no,scrollbars=yes,toolbar=no,resizable=yes,top=20,left=20';
	} else {
		options = _options;
	}
	
	var newWindow = window.open(_url, _title, 'width=' + _width + ',height=' + _height + options);

	return false;
}