function popup(url, h)
{
	var width  = 560;
	var height = h;
	var left   = (screen.width  - width)/2;
	var top    = 200;
	var params = 'width='+width+', height='+height;
	params += ', top='+top+', left='+left;
	params += ', directories=no';
	params += ', location=yes';
	params += ', menubar=no';
	params += ', resizable=no';
	params += ', scrollbars=yes';
	params += ', status=no';
	params += ', toolbar=no';
	
	var  newwindow=window.open(url, '', params);
	if (window.focus) {newwindow.focus()}
}