<form class="ajax" action="%SCRIPTURLPATH{rest}%/...">
...
<input type="submit">
</form>

%ADDTOZONE{"script" id="ajaxform" text="<script>
jQuery(function($){
  $('form.ajax').ajaxForm(function(){
    alert('submitted');
  });
})
</script>"}%
%JQREQUIRE{"form"}%