The script itself already has an alternative method built in. Try these instead of your anchor links (adapted from the moveup() and movedown() functions):
Code:
<a href="#" onclick="crossobj.style.top=(contentheight*(-1)+100)+'px';return false;">bottom</a>
and:
Code:
<a href="#" onclick="crossobj.style.top=0;return false;">top</a>
Using the two above links as templates (assuming they work in your browsers), you should be able to devise a way to scroll to just about anywhere you need to within the scrollable content area.
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