[jQuery] Can this be done with jQuery?

[jQuery] Can this be done with jQuery?

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<font size="-1"><font face="Tahoma">Hello,
I was planning on moving from Prototype and Scriptaculous (now a
whopping 180kb --> 45kb with gzip on) to jQuery.
</font></font><font size="-1"><font face="Tahoma">Most of the things i
need are doable in jQuery but </font></font><font size="-1"><font
face="Tahoma">I am missing a few things however, or the lack of a demo
:)
<b>Sortables;</b>
a jQuery only implementation of sortable lists. Not the one in the
discussion because that one is plain ugly.
<b>Form submission to a div;
</b>A demo showing a form being submitted by $_POST, to a div. I have a
form in a lightbox. I want to post that for into thesame div that the
form is currently in. For instance, the form is in #lb_content, and i
want to post the form to #lb_content with the action of the form. This
page then generates content which is put into #lb_content. In prototype
is used Element.Update for this.
pseudo code here:
        new Ajax.Updater('lb_content',
            strAction, {
                method: 'post',
                parameters: strPostBody,
                asynchronous: true,
                evalScripts: true
            }
        );
It's very important for me that i can update a div, and process the
scripts in the results.
<b>Ajax loading indicator;</b>
Is there an ajax loading indicator in jQuery? E.g. this code works for
prototype:
Ajax.Responders.register({
    onCreate: function(request) {
        Element.show('ajaxBusy');
    },
    onComplete: function(request) {
        Element.hide('ajaxBusy');
    }
});
Thanx
Gilles
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