How to add onmouseover over text in pass-thru html

Hi, I have a pass-thru text, which is a html table with values.

I want to show (doesnt matter how !) an extra value, if you mouseover a piece of text. (or table row)

(Pls note the document is in a frame :o( )

This will only be opened in client.

Any ideas are welcome.

Regards

Cédric