widget_prompt utility function. Simpler/better than the evil fancy_prompt, you shove...

widget_prompt utility function.  Simpler/better than the evil fancy_prompt, you shove a node in, and when a user clicks Okay, the node's value gets passed back out.

var value = widget_prompt(
    $('existing_menu_list_we_want_to_reuse').cloneNode(true),
    {
        'title' : 'titlebar text, also used as a key for dialog height/width peristence',
        'desc' : 'description to shove above the widget'
    }
);