Image submit with mouse over

Hi all, Brand new to the list, so here's my question. I am implementing a bunch of Dreamweaver templates a designer has built into a PHP app, and one thing she did is create a submit button (image) that uses mouse over JS: <a href="user.php?req=login" target="_top" onMouseOver="MM_swapImage('signin','','/theme/images/admin/button_signin2.gif',1)" onMouseOut="MM_swapImgRestore()"><img src="/theme/images/admin/button_signin.gif" alt="Sign In" name="signin" width="86" height="20" border="0"></a> But notice this is an href, and it also needs to submit $_POST data through a couple of form fields that appear above. So what I tried to do in order to be able to retrieve the POST data on the receiving end was convert it to the following: <input type="image" src="/theme/images/admin/button_signin.gif" onfocus="MM_swapImage('signin','','/theme/images/admin/button_signin2.gif',1)" onblur="MM_swapImgRestore()"> ...However, the onfocus and onblur are not swapping out the images, as I had hoped. (Against all odds, maybe I should add.) I know the client will pout and sniffle if they don't get their mouse over affect, so I am hoping for a solution. Any suggestions would be greatly appreciated. Thanks! -- Skip Evans Big Sky Penguin, LLC 61 W Broadway Butte, Montana 59701 406-782-2240