submitting to differient php scripts based on button -O T-

Hi, This is more of a JS question than a PHP but have not found anything on google (http://www.google.com/search?q=javascript+onclick+button&sourceid=opera&num =0&ie=utf-8&oe=utf-8) and cant remember how I did this last time I simply want to submit my form to either one.php or two.php or thr.php depending on which BUTTON is pressed (I am using html buttons <input type='submit' value='blah'>) I have 3 buttons....how do i set it? Sorry this is so O T but any help appreciated. Thanks, -Ryan