Background images in lists

[Antoniohawk]

How can I achieve the effect of using a background image as my bullet in a list. As you can see in the following page, it puts in half way down the list when i have the 50% in the position. I still want the image centered in relation to the list item text.

http://www.graphics-forum.com/manicpyro/newGenTreeMenu.html

[MattJakel]

Well, I can't see it because the link isn't working...