I see you're willing to submit dynamic attributes to the div loading url.
You can easily do that using the formIds
parameter of sj:div
<sj:div href="%{some_url} formIds="myform"></sj:div>
<form id="myform">
<input name="xyz" value="abc"/>
</form>
Now whenever the div reloads, it submits the specified form to that url.