Instead of putting each button in it's own line in the html, move them all together starting one right after the other. Like this:
Code:
<img src="images/home-wp.jpg" width="114" border="0"><img src="images/templates-wp.jpg" width="115" border="0"><img src="images/adult-wp.jpg" width="115" border="0"><img src="images/logos-wp.jpg" width="115" border="0"><img src="images/corporate-wp.jpg" width="115" border="0"><img src="images/webmaster-wp.jpg" width="113" border="0">
I don't know why this works, but it usually does.