redirect to new page
In your form tag you haven't entered the results page name eg
<form id="form1" name="form1" method="post" action="name_of_your_results_page.php">
If you want the the drop list items you selected to be remembered I would also put this in the body tag:
onLoad="WA_FilterAndPopulateSubList(Child_WAJA,M M_findObj('Parent'),MM_findObj('Child'),0,0,false, ': ')"