Table with scrollbar

I have a huge table that is within <div> tag for scrolbar purpose.

Now I need to check whether a particular row of the table is visble say row with ID "R22". How could this be done?

Please help.

Thx
Anu

You might be able to use the script here to see if you can find its location. Not positive it will work, but worth a shot.

http://www.coderanch.com/t/114176/HTML-JavaScript/Coordinates-objects-without-Absolute-postioning

Eric