how to apply style to a browse button that's created automatically with <input type="file">

Here is the problem, I have a form with several buttons on it, and i've turned them all blue with a style <input type="button" class="BlueButton" value="whatever">

but, for the browse button, i cannot apply a style to it, because i didn't actually make the button explicitly, rather it got created automatically when i made a <input type="file">

here's a picture of the problem i am having:

http://test.tolkoems.com/tolko/images/browseproblem.gif