We currently use Meta Tracker to track clicks on a link to a specific document.
An example of the code would be
the document
How do you apply this type of code to a submit or search button?
So that you can track application use (many clicks)versus just a page hit.
Tracking a button click
It may be possible to track a button click by using the redirect tracking method and setting this URL in the action parameter of your form. If you are posting form information to a page, I doubt this will be passed once the page is redirected. The best thing to do would be to experiment to see what works.
Regards,
~Chad