The "action" attribute is required for form elements.
See the W3C specification:
http://www.w3.org/TR/REC-html40/interact/forms.html#edef-FORM
Your jQuery code in itself seems correct, but make sure that the selector works.
Maybe use the form id for the jQuery selector, to be sure that the selection is not a set of elements but the form itself.
The "onsubmit" event handler is optional. I assume you use it to prevent the "action".
Try removing the "onsubmit" event handler as you already manage this with jQuery.
Try this
*:
action="javascript:return false;"
or
or
action="document.location=this.location"
*Not verified, just a few ideas
Hope this helps. It’s late here and I probably won’t answer tonight anymore.