PNG is obviously the best choice for images when designing websites. This can be argued of course, but the file size is small, and most importantly, there is true transparency available. If you ever see a cool little badge floating around on a website, chances are that it’s PNG. That said, I don’t use them.
Why? [...]

There is good reason to discontinue support of older browsers, and Microsoft even now recommends to quit building sites for Internet Explorer 5.
Here is what they say
Basically, they can’t build there own websites to work with such an old browser. While there is benefit in making sure your website looks good across all browsers, there [...]

Getting a website to look right across multiple browsers seems to often be a pain. If the site design will allow for it, I suggest beginning with a template you know will work well across multiple browsers, thus alleviating the need to trouble shoot once you have already built the site.