I was just wondering how most QA teams are handling the testing of web based applications on multiple platforms. We have a web app that uses applets, JavaScript and html.

Our team is required to test against browsers running on Windows, Mac OSX, Linux, and Solaris.

On the Unix platforms, that limits our browser choices to Netscape and Mozilla. I've tried searching on the web but there doesn't appear to be any automated tools out there for Unix. Are there any suggestions?