just add this code in the <HEAD> part of your html code:
<STYLE>
.TA {scrollbar-3dlight-color:;
scrollbar-arrow-color:;
scrollbar-base-color:;
scrollbar-darkshadow-color:;
scrollbar-face-color:;
scrollbar-highlight-color:;
scrollbar-shadow-color:}
</STYLE>
after the : put in the hex color (i.e. #000000) or just type the color. it needs to be a web safe color name. Best to start out with like red, blue, etc and then google for the other names.
EDIT: Here is a good Scrollbar Stylesheet generator. It basically lets you choose the colors of the options above and gives you the code for it. (note: it requires that you use IE, not firefox, mozilla, etc)
Scrollbar Styleshee Generator
