Hello Javascript professionals!

I am looking for some help here...I'm working on my wordpress blog site and I see that the images are stretched. I've checked other websites with the same themes but they don't. It seem to have the problem with changing dimesion from 16:9 to 4:3 so I believe there's something wrong with my code.

Does anyone can have a look into my codes and give me some help what to change or rewrite, alternatively I can post my javascript coding just let me know from which of the following wordpress files?

* 404 Template
(404.php)
* Archives
(archive.php)
* Blog Page Template
(tpl_blog.php)
* Comments
(comments.php)
* Footer
(footer.php)
* Header
(header.php)
* Main Index Template
(index.php)
* Page Template
(page.php)
* Portfolio Page Template
(tpl_portfolio.php)
* Search Results
(search.php)
* Sidebar
(sidebar.php)
* Single Post
(single.php)
* Theme Functions
(functions.php)
* breadcrumb.php
(breadcrumb.php)
* header-portfolio.php
(header-portfolio.php)
* style.php
(style.php)
* timthumb.php
(timthumb.php)
* upload.php
(upload.php)
* wp-pagenavi.php
(wp-pagenavi.php)


My website is http://www.freewordpressblogsite.com/

Thanks a lot in advance for any sort of help.

Henry