problem with IE and php

Hi all, I running two php web page...therefore the page name has the ".php" on the end. The first page contains a form with a submit button at the botton. That submit button actions the second ".php" page. When I use my firefox browser everything works fine. When I use Internet Explorer, the submit button does not work. the button is the following: <tr><td> <input type="submit" name="submit" value="Commit"> </td></tr> Could the html be treated differently when there is php around it or maybe when we use ".php" could the html be treated differently? Oh yeah, I created a duplicate of the pages with no php and had the two pages marked as ".html" and the button worked fine. Any help would be great. CHeers Phil