[FCK] undefined error

Hi,

I'm not sure am I allowed to post this topic here, but here's my problem...

Let's make this simple, I am totally newbie in coding.

I installed a lightbox patch to FCKeditor, and I tried to modify it a bit so I could add a title into it. I kind of managed but...

Here's the html code which I added to the html file:

               <div>
                 <br />
                 <input id="txtTitleLightBox" style="width: 100%" type="text" />
               </div>