After looking at your code, it appears you have told the browser to show each image twice.
change this code
<td>
<img src="images/home_original.gif" width="110" height="30" alt=""><a href="home_page.html" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Image19','','images/home_rollover.gif',1)"><img src="images/home_original.gif" alt="home" name="Image19" width="110" height="30" border="0"></a></td>
to
<td>
<a href="home_page.html" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Image19','','images/home_rollover.gif',1)"><img src="images/home_original.gif" alt="home" name="Image19" width="110" height="30" border="0"></a></td>
eliminating the leading image from each button.