Can you fake a onClick?

I have checked the archives and not really found an answer, so here goes. My form contains a function called CountIt which increments a counter file on the site. I mainly use it to count the hits on the page. I also have multiple <a> links to .zip & .txt files which can be accessed or downloaded. Is it possible somehow to fake an onclick event so that when the user clicks on the link I can use the CountIt function to increment a counter for that link?