Hey, noticed your sig is pretty small, thought i'd just say how to get it the size that it was made to be, incase you weren't aware.
Basically, right click on the image in Spazaz's post, then click 'Copy Image URL'. Then in your sig editor, click this: and paste the URL in that box and press enter/ok. Then Center it as you normally would.
Or, you can just copy and paste this in your sig editor;