EnjoyRails

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<a href="javascript:questions.scrollTop = 0;">Move to Top</a>
<a href="javascript:questions.scrollTop = questions.scrollHeight;">Move to buttom</a>

<div id=questions>
# content for div questions.
</div>

scrollTop gets or sets the number of pixels that the content of an element is scrolled upward.

// Set the number of pixels scrolled
element.scrollTop = intValue;

scrollTop can be set to any integer value, however:

If the element can't be scrolled (e.g. it has no overflow), scrollTop is set to 0.
If set to a value less than 0, scrollTop is set to 0.
If set to a value greater than the maximum that the content can be scrolled, scrollTop is set to the maximum.