how to create different bullets for different list items?

To set this up, follow the steps for creating personalized bullets.
http://www.itechies.net/dev/details_faq.php?sbres_id=83

Next, create additional rules that replace the generic bullet graphic with images that are appropriate for each type of list item. For example, to create the PDF bullet, you’d type:

li.pdf {
background-image: url(pdf.gif);
}

Repeat this for each type of bullet you want to create.

Now, when you create a new list, reference the appropriate bullet type for each list item. For example, the HTML for a list item that links to a PDF might look like this:

Bullet, Know Thyself These bullets give readers a clue about what type of documents the list items are.

<ul>
<li class="pdf"><a href="brochure.pdf">Our Brochure</a></li>
</ul>