[jQuery] Wrap all "center" tags

[tij_dev]

Hello everybody,

I have a doc xml (which is not my window.document) which contains some
"center" tags and I would like to wrap all of them with a specific
"div" element.

I tried doing :

$("center",pDocument).wrapAll("<div class='wrap'></div>");

pDocment is my xml dom. but it says "Non valid argument"... :(

Please HELP !!!!!

Thanks a lot :)