Disappearing text in IE 7 when setting className

Can anyone help me with a problem that I have with apparently unrelated text disappearing in IE7 when I set a className.
This does not happen in Firefox.
I am trying to create an Ajax driven table where you can click on an active cell to pop up a form, then submit that form to modify the cell value.
My page uses several layers of tables and divs in different sequences.
Setting the className of a div within a deep table causes text to disappear in divs in a different table.

It sounds confusing, but the page is really very simple and should work.

http://www.pleasantcreek.com/test/

Mousing over the mouseover area causes the test text in divs to disappear.

re: Disappearing text in IE 7 when setting className

try using
how does that work for u?

good luck

re: Disappearing text in IE 7 when setting className

Thanks for replying to my problem.

I tried your suggested change, but it did not work.

The result is at
http://www.pleasantcreek.com/test/index1.html