Prototype Ajax.Updater Problem

I may be missing something simple here, but anyway, here goes. I have a simple form, a couple of inputs, and the FCK object, which should contain the main body of text for the form. If I use an onClick to call a Prototype Ajax.Updater function to do something with the data, PHP Info shows that nothing from the FCK object is passed. This does work if I use the Submit, but I'd really like to use the Prototype function still.

Does the FCK editor not work well with the Ajax.Updater call?

Thanks for any advice!