I link it from an external CSS file in the header. Works fine.

body {font-family:Arial,Helvetica,Geneva,Swiss,SunSans-Regular,sans-serif;scrollbar-face-color: #336699; scrollbar-shadow-color: #333366; scrollbar-highlight-color: #cccccc; scrollbar-3dlight-color: #9999cc; scrollbar-darkshadow-color: #000055; scrollbar-track-color: #cccccc; scrollbar-arrow-color: #ffffff}

That line just tossed into a .css file and linked from within the header.

Bruno