...użyć konstrukcji JS:
<button onClick="window.open('object_search.php?src_form=acl_admin&object_type=aro§ion_value=' + document.acl_admin.aro_section.options[document.acl_admin.aro_section.selectedIn
dex].value + '&return_page={$return_page}','','status=yes,width=400,height=400');return false;">Przycisk
</button>