what to do? cont...
Choose a Strategy:
a. Use only simple stuff: basic html: tables, frames, font tags, and maybe a plug-in here or there. This is great for people who just want to get information out there. And even if someone has a really old browser that cannot see images, you can use a tag (Alt) that will put in a text description of the image instead, if the user doesn't have it.
ex. <img src="cat.jpg" alt="My cat Alex" />
b. Experiment: Forget about it. Adopt new technologies regardless of support. Abondon the user, forget about the older browser generation. Just do so remembering that alienation can be a bad business decision. But if your not about that, then go for it. How do you know if this is you? If you find yourself putting: "this page is best viewed with..." on your site.
c. Or live somewhere between a. and b. from above. You can make multiple versions of content for multiple versions of browsers (sounds like a pain---it can be). You can use scripts to detect what browser a user has and serve different versions of your site accordingly. With this strategy you really only need to make an a. and a b. version ---high end and a low end---of your site (one for older and one for newish browsers).