Help the website is ordering me to do things

[Shinigetsu]

I was forced to start using an old imac g3 due to lack of other computers. Now this vary website told me to update my browser, and most of the internet is incompatable. I tried to update it myself but I am inexperenced with macs and nothing works with OS 9. If anyone knows where I can find anything higher than netscape 7 or internet explorer 5 that works I would be vary greatfull.