I'm going to preface this by saying I know next to nothing about implementing jquery. Thus far, I've just been very lucky and able to figure out a few things on my own.

I have a simple form on my site that, upon clicking "submit" calls a PHP file. 

I'd like to have a modal dialog box open when you confirm submission 

(like this.... http://jqueryui.com/demos/dialog/) but can't understand how to target the submit button to make this happen.

http://theassemblydesign.com/

I already have jquery script on my page but dont know what to do from here. 

I would appreciate any help!!