I have a form in http://recruit.mnetrade.com/sample_add_form.asp

In my sample_add_form.asp, it has
<form name=myform action="sample_add_form.asp" method=post>

When I onchange my specialization drop down box, it will automatically load sample_add_form.asp and there are some code to retrieve the second drop down box.

And at the end, after I fill in all fields and click Save, the page should be sample_add.asp. So, how do I go about this? Thanks.