thanks for your answer.
Yes, I know it. I would like to know how to create it at runtime.
I'am using
$('body').append('<div id="np"></div>');
$('#np').navpanel();
but I would like to get it from a .php file like I do with refresh method of panel.
All that I can load from an external file is its content but not the header, toolbar, title, etc..
Is it possible?