I have been having problems with this. I think this should be pretty simple but I cannot seem to get it to work. I want a new image to appear when rolling over my facebook button. Thanks for your help!

    <p align="right">
          <a href="http://www.facebook.com/AerialistPress" ><img height="30px" id="facebook" class="changePad" alt="Aerialist Press Facebook Page" src="/sites/aerialist.localhost/files/images/facebook300.jpg" /></a> 
           <a href="http://twitter.com/#!/AerialistPress" > <img height="30px" class="changePad" alt="Aerialist Press Twitter Page" src="/sites/aerialist.localhost/files/images/twitter300.jpg" /></a>
           <a href="http://www.pinterest.com/aerialistpress" ><img height="30px" class="changePad" alt="Aerialist Press Pinterest Page" src="/sites/aerialist.localhost/files/images/pinterest300.jpg" /></a>
</p>

<script>
jQuery(document).ready(function(){
     jQuery('#facebook').mouseover(function() { jQuery('#facebook').attr('src').replace('/sites/aerialist.localhost/files/images/facebook-roll.jpg'); })

});
</script>