Migration from 1.6 to Apex 3.1 - Popup windows no longer working

Question

We just moved our application to Apex 3.1 from HTMLDB 1.6. The only thing that is not working since we migrated is the popup window that used to work. Now a window still pops up, but it is the login screen, not the expected window, and even if one logs in at that point, it just takes them back to the main screen, not to the expected popup window. Is there some setting I have to change to make it work as it did before, or does the code go somewhere else now? This is the code:
The URL redirect of a button on the calling page: javascript:callMyPopup('P4_PRI_CONTACT_ID');
The javascript on that same page: <script language="JavaScript" type="text/javascript">
function callMyPopup (formItem1) {
var formVal1 = document.getElementById(formItem1).value;
var url;
url = 'f?p=&APP_ID.:10:::::P10_CONTACT_ID:' + formVal1 ;
w = open(url,"winLov","Scrollbars=1,resizable=1,width=800,height=600");
if (w.opener == null)
w.opener = self;
w.focus();
</script>

Answer 1

As of v2.0 session IDs were required for f?p URLs. Oracle® HTML DB Release Notes Release 2.0 Part Number B16374-02
Mike