active/x controls are not form elements, and thus are not form children, so
you cannot reference them from the form as you are trying.

try:

myControl = document.getElementById('hdnCustName'); // supply id attribute
on <object tag>
myControl = document.getElementByName('hdnCustName')[0]; // supply name
attribute on <object tag>

also active/x control are loaded async. they can be null until the onload
event fires. properties should not be accessed until readyState == 4, as the
object maynot be created or init until then.

so you normally do something like:

// loop until ready - burns cpu - should use setTimeout
myControl = null;
while (true)
{
   myControl = document.getElementById('hdnCustName');
   if (myControl && myControl .readyState == 4)
       break
}

// can now access control (may never get here)

myControl.prop = ...

-- bruce (sqlwork.com)