A friend just told me a nice little "easter egg" of IE6 that is doggone hard to debug when one doesn't know about Redmond's little secrets plot to make a web developers life hell (me conspiracy theorist? never!)
Turns out that IE6 has a css file limit per page that kicks in with the 32nd file, where it simply doesn't seem to read the contents of the file. And if you are mindful of this and slap all your CSS into less than 32 files, the beast still gets you by the nuts because there also is a total CSS size limit.
Go do yourself a favor and download firefox ....
more details here