Wordpress quick help please. +Small reward Change the previous entries button

I want the "Previous entries" link to Become an actual button thats easily visible. On my Anime streaming site now, it's very difficult to see the "previous entries" Take a look
http://animethat.com/?cat=95

I want the Previous Entries button to be an Actual image, or Substantially bigger, or maybe even read as "Older Episodes"

3$ To anyone that helps me get this fixed!

 

Open your theme's index.php file and find the following code:

<?php posts_nav_link(' - ','&#171; Newer Posts','Previous Posts &#187;') ?>

PHP:

Replace it with code like this:

<?php posts_nav_link(' - ','<img src="newerposts.gif" border="0">','<img src="olderposts.gif" border="0">') ?>

PHP:

Just replace "newerposts.gif" and "olderposts.gif" with the location of the images you would like to use. Done!

 

Your welcome for the help. Too bad I never received a "thank you" or the $3 as promised.