Any HTML/JAVASCRIPT experts out there?

I'm new to this game and despite asking for advice from work I cannot get the following problem sorted so would be grateful if anyone could help:

In Internet Explorer, changing the text size has no effect and the following page works fine:

http://www.britishairways.com/regional/germany/index.shtml

However in Netscape4.73, the page only works correctly when in the default font size. If the font size is increased/decreased, then the mouseover option over the headings produces the description text on the left in a different place and sometimes it goes over the images. Not nice at all.

I've noticed in the source code that the css parameter 'top' for "theContent" is set at 315. Now if I change this, Internet Explorer will put the text starting at that position. However in Netscape, the start of the text depends on the font size selected.

Can anyone help?

I didn't write the code at all but I have to make some changes and while I was doing this, I spotted this feature in Netscape.

So can anyone help a fellow scooby driver come up with a solution?

Thanks