I never disputed your first one not working, only clarifying your other thread and this one as to why it most likely was not working for you when you passed in the ID.

Like I said earlier, your error is most likely due to you pulling a cached version of dnn.js.

Version 3.3.2 of DNN had this code in the dnn.js file

function $()
{
  var ary = new Array();
  for (var i=0; i<arguments.length; i++)
  {
    var arg = arguments[i];
    var ctl;
    if (typeof arg == 'string')
      ctl = dnn.dom.getById(arg);
    else
      ctl = arg;

    if (ctl != null && typeof(Element) != 'undefined')   //if prototype loaded, we must extend the object
        Element.extend(ctl);
       
    if (arguments.length == 1)
      return ctl;

    ary[ary.length] = ctl;
  }
  return ary;
}

Version 3.3.3 contains this fix

function $()
{
  var ary = new Array();
  for (var i=0; i<arguments.length; i++)
  {
    var arg = arguments[i];
    var ctl;
    if (typeof arg == 'string')
      ctl = dnn.dom.getById(arg);
    else
      ctl = arg;

    if (ctl != null && typeof(Element) != 'undefined' && typeof(Element.extend) != 'undefined')   //if prototype loaded, we must extend the object
        Element.extend(ctl);
       
    if (arguments.length == 1)
      return ctl;

    ary[ary.length] = ctl;
  }
  return ary;
}

I am guessing that you either have an old version of the file on your server or FireFox is pulling a cached version.

Okay I had cleared Firefox and it still gave me the same error but after reinstalling DNN from scratch and reinstalling the module it worked - not sure why I would have had an old file in a new install but it works now 

Thanks for helping me with this -