[jQuery] Getting a fragment of ajax html and writing to the page

[[EMAIL PROTECTED]]

Hi, can anyone tell me how I can get part of a web page downloaded
with $.get()? I thought it would be easy but ohhh no :( Here's a
snippet:

$("[EMAIL PROTECTED]").click(function()
{
        $.get($(this).attr("href"), function(popUpData)
        {
                var popupContent = $(????);
                $.modal(popupContent );
        });
        return false;
});

At '????', I basically want to find the contents of a div in popUpData
with an ID of foo as a string I can pass to a modal pop-up. The web
page fetched is HTML 4.01 Strict.

Thanks for any help,

Richard

P.s. $.modal is: http://www.ericmmartin.com/projects/simplemodal/