hidden text field or setting a compute field via javascript

Hi everyone,

I'm trying to do something a complete newbie should not be: trying to use flash, js and cck. I have put in flash swf and a js function into a compute field. Flash uses as to call the js function that sets a string in a text field in a cck form. I use cck to save the value and use the save value to re-init the flash.

Here's the problem, I want to hide the text field used to save the value. Is there a way to hide this field? Is there an easy way to extend cck to hide a text field?

Alternatively, is there a way to set a compute field via js?

Thanks
John