netscape4 + css = pain! Mercifully, there is the @import rule - I'm sure you'll turn up some good threads on that here if you're not familiar with it.
Get ready to make a separate style sheet for netscape - in it assign a padding-left attribute for your table cells with a percentage. You'll have to play with the numbers to get it where you want it. The catch with @import is that you'll need to have a corresponding padding-left (with a different value) in your main style sheet or other browsers will use your netscape style.
It's alot of extra work, but if you need to support NS 4.x it'll do the job.