How to customise AddThis Sharing icons

As websites rely more and more on social networks to promote their presence, it's nice to be able to customise the default icons you usually get with “Add this” and “Share this”.
 
Good examples of social icons
 
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How to customise Addthis.com sharing tools
 
The original code from Addthis.com will use default icons from its library. But you can change this and customise using your own images. Heres how:
 
1. Remove "addthis_default_style" from the main
class.
2. Wrap the within an ul li
3. Add Class to each li "class="twitter" etc…
4. Style using CSS (See CSS code) Best to use a sprite image like this
 

 

Original HTML Code

 

 

CSS Code