I have Netscape for the mac available on a high density 3.5 that you can copy.
I will soon have the same available for IBM. I have the netscape file, some Windows "trickery" is necessary first, to make it run. A friend of mine at Math Comp Sci will speak with one of Comp Instructors about making it a class project to strip down Windows to something that will only run Netscape, and that will fit on a 3.5. Once this is prepared, you can take a 3.5 with Netscape and the "Netscape Windows" and put it in any IBM computer, and it will run IBM Netscape for you. I hope this works :)