Hmm.

Well I don't know.

Surely Overflow: auto; would work in this instance. Has for me before?

Rather than use a td element, bung a div into it and do the following:

HTML Code:
<div style="width:WHATEVERpx;height:WHATEVERpx;overflow:auto;">
Content of div here.
</div>
Obviously changing WHATEVER to the size of the td.