Until Gordon can get it done you could use the blue arrows top and bottom. The curser is white on my PC and I have no trouble with it.
Gordon you have to go into the HTML code and inset something like this
scrollbar-arrow-color: #000000;
scrollbar-base-color: #000000;
scrollbar-darkshadow-color: #000000;
scrollbar-track-color: #000000;
in the head area there is a body with margin=0
stick that scrollbar code in there, below the margin & padding settings
and just change the RGB codes to the colours you want. You will get the RGB code of the colour you want from PSP. Click on the colour to open up the full pallette an you will see the RGB code at the bottom.