show featured image straight without Timthumb.php

Hello,
I am using Network Theme and I always use featured images size of 227px by 108px for every post (so I dont need to resize the images and therefore dont need the usage of Timthumb.php

I would like to know how to show the featured images straight on Network front-page without using Timthum.php because I use CDN and want pictures to show up as:
<img src="cdn.domain.com/blogs.dir/1/files/2011/11/image.png&h=108&w=227&zc=1&multisite=true&blogdirid=1" alt="" style="width:227px; height: 108px;"> inside the source page to make the page load faster.

Currently its showing inside the source code:

<img src="domain.com/wp-content/themes/network/library/functions/timthumb.php?src=blogs.dir/1/files/2011/11/image.png&h=108&w=227&zc=1&multisite=true&blogdirid=1" alt="" style="width:227px; height: 108px;">

Any help will be greatly appreciated.
Thanks