APEX_ITEM.DATE_POPUP javascript error

Question

Hi there
I have a dynamic report I have built where the date popup has stopped working.
The date popup works fine for other form fields in other regions on the page but within my dynamic sql report region the javascript is erroring when clicing on the calendar image.
The Apex version is 2.2.
The code in the dynamic report is: APEX_ITEM.DATE_POPUP(5,rownum,action_date_time,'dd-MON-RR',9) action_date_time
The Jscript error is basically: document.forms.0.f05.length is null or not an object.
The input object in the HTML source is: <input type="text" name="f05" size="9" maxlength="2000" value="03-OCT-06" style="padding-right:5px;" />
And the Jscript which refers to it is immediately after:
function genCalf05_0()
elemArrLen = 0;
if (document.forms[0].f05.length) {
elemArrLen = document.forms[0].f05.length;
... etc...

Answer 1

I have discovered why the calendar control is not working -
As a customisation I included another <form> tag in the menu which is interfering with the popup (forms[0]).
I may need to look into either doing my customisation a different way (it is above the standard form tag in the menu) or see if I can write some type of custom calendar popup.
When the calendar control in the actions region is built - some javascript is written by APEX which I have no control over - it looks like
" if (document.forms[0].f05.length) {
elemArrLen = document.forms[0].f05.length;
}"