APEX

Hi,
I am getting a javascript error on my page. The line given corresponds to a line in the htmldb_html_elements.js. Specifically in the html_Return_Form_Items function:

l_Selects = l_This.getElementsByTagName('SELECT');

Im getting a "null or not an object" when I am attempting to use:

html_RadioValue(radio_grp_name);

I am runninig the code onload to show/hide rows based on user selection. The code WORKS FINE until I make a validation error, and I hit the validation page. Then the error is genereated.

I had thought that best practice was to use oracle supplied functions (html_RadioValue) although in this case the oracle functions dont seem to work properly. Anyone got any experience of this?