Problem with bullets (unordered lists) with Artisteer-created theme

I've created my website's theme using Artisteer and I'm having a problem with bullets in unordered lists. The problem is that Artisteer requires you to select a custom image for bullets and doesn't have an option to just display the browser's default bullets. It's not a big problem in Firefox because it displays as a normal list, however in Internet Explorer it displays two bullets (the default and the custom) for each list object. How can I just remove the settings for the custom bullets in the style.css file and have each unordered list display normally with the default bullets? I've tried changing and removing things but I can't seem to get it to display properly. Can someone who is more experienced with Drupal themes take a look at my style.css file and let me know what needs to be changed? I'd appreciate it. Posted below.