html-el and javascript access

Question

Hi, I suppose this is a bit of a newbie question but I'm trying to fix a bug on code I've inherited. Basically the <html-el> tag defines the following and works fine
<html-el:form action="saveConsumer" styleId="consumerForm" disabled="${consumerForm.formDisabled == 'true'}">
However, there are a couple of fields on the form that call a javascript function to independently enable/disable the fields depending on which user is logged in, so I'm trying to access the value of the consumerForm.formDisabled boolean within javascript but can't seem to do so, I've tried whats below but it won't work - any help would be much appreciated!
Thanks.
Ray.
<script type="text/javascript">
     function connectionPolicyToggle() {
          var element = document.getElementById('connectionPolicy');
          if (element.value == 'ALWAYS') {
               document.getElementById('connectionThreshold').disabled='true';
               document.getElementById('connectionFrequency').disabled='true';
          } else {
               document.getElementById('connectionThreshold').disabled='document.consumerForm.formDisabled.value';
               document.getElementById('connectionFrequency').disabled='document.consumerForm.formDisabled.value';
     }

Answer 1

Thanks for that
Just in case anyone else needs a simple version:
var SlideNumber = 4;
if(typeof window.cp === 'undefined'){
    if(SlideNumber != '') {
document.getElementById('Captivate').cpEISetValue('m_VarHandle.cpCmndGotoSlideAndResume', SlideNumber  -1);
}else
    if(SlideNumber != '') {
            window.cpCmndGotoSlideAndResume = SlideNumber-1;
Thanks
Luke