Help with a custom PHP script / wordpress

Hi guys,

We have created a small PHP script which will load a particular image dependent on which category the blog is posted in.

On our website index (index.php) we have the following codes:

Header:

<?php

require('blog/wp-blog-header.php');

?>

Body:

<?php

if(get_the_category_list(', ')=="john-virgo")
{
    ?>
                              <img src="images/top5.jpg" width="100" height="100" alt="" />
                              <?php
}
elseif(get_the_category_list(', ')=="something")
{
    ?>
                              <img src="image2.jpg" width="100" height="100" alt="" />
                              <?php
}

?>

But this is not working correctly.

If I set the criteria to be ‘uncategorized’ then it will load the image, but any other category title and it won’t.

Any ideas?