Making a checkbox readonly via a js function

I can disable the checkboxes but I can't make them read only.

I am able to do this, so I know it works:

<SCRIPT LANGUAGE="JavaScript">
   function disableform(staff_access_allowed_add_recordcount) {
   for (i = 0; i <= staff_access_allowed_add_recordcount; i++) {
      document.updatestaff.dmhfacil[i].disabled = true;
      }
}
     </SCRIPT>
<SCRIPT LANGUAGE="JavaScript">
 function enableform(staff_access_allowed_add_recordcount) {
 
  for (i = 0; i <= staff_access_allowed_add_recordcount; i++) {
        document.updatestaff.dmhfacil[i].disabled = true;  
            }

}
</SCRIPT>

BUT I AM UNABLE TO DO THIS:
<SCRIPT LANGUAGE="JavaScript">
   function disableform(staff_access_allowed_add_recordcount) {
   for (i = 0; i <= staff_access_allowed_add_recordcount; i++) {
        document.updatestaff.dmhfacil[i].readOnly = true;
        document.updatestaff.dmhfacil[i].style.backgroundColor="#CCCCCC";
         document.updatestaff.dmhfacil[i].style.color="#FF0000"
      }
}
     </SCRIPT>

<SCRIPT LANGUAGE="JavaScript">
 function enableform(staff_access_allowed_add_recordcount) {
 
  for (i = 0; i <= staff_access_allowed_add_recordcount; i++) {
         document.updatestaff.dmhfacil[i].readOnly = false;
        document.updatestaff.dmhfacil[i].style.backgroundColor="#FFFFFF";
         document.updatestaff.dmhfacil[i].style.color="#000000"
      }

}
 

  </SCRIPT>
 
This is the CF that calls the Javascript:

<cfinput type="radio" name="disable_enable_radio" onclick= "enableform(#staff_access_allowed_add.recordcount#); return true;"
value = "Enable" checked = "#disdte_is_null#"><b>Enable</b>


</td>
<td>
<cfinput type="radio"  name="disable_enable_radio"  onclick="disableform(#staff_access_allowed_add.recordcount#); return true;"      
value = "Disable" checked = "#disdte_not_null#"><b>Disable</b>
</td>

 
 
THis is the cfquery that gets the recordcount:
<cfquery datasource="clinical" name="staff_access_allowed_add" >
 
 
 SELECT distinct dmhfacil, (select dmhfacil from staff_access b where code =
      '#updatecode#' and b.dmhfacil = staff_access.dmhfacil) was_it_selected
             from staff_access
       where dmhfacil in (select dmhfacil from staff_access where
        code = '#URL.entryStaffcode#')
      

     
</cfquery>
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