Getting rid of GreenTrack Bullet img

I am using a self-modified version of GreenTrack 2.0, and I’m not really a big fan of the image that has been created for the content section. I want to use the default block dot, then white dot, etc…basically, the browser default. How should I change the code below to make that happen?

\\#content ul {
margin-left: 0;
padding-left: 15px;
list-style-type: none;
}
#content ul li {
background: url(img/bullet.png) no-repeat 0 7px;
padding-left: 1.5em;
}\\