Is it possible to pass a selector into a function?

Is it possible to pass a selector into a function?

I am attempting to hack a jQuery extension that does an ajax style form submit. The final result is an image uploader that can run inline. The script is fairly simple - it creates an iframe with a new form, and copies over a form element (the file name), and submits the form. Plus error handling and the like.
 
The problem is that I need to use from within MVC, and so I need more form values, like the ID of the item I am working on. It would be easy to add another configuration setting for an additional form element to copy over, but I really want to have the ability to pass a jQuery selector in and use that to specify the form elements to copy. Is this possible?
 
I would be happy to post code if that would help.
 
Thanks,
Erick