found some links I wanted to share with you:
1. IE Tester –
http://www.my-debugbar.com/wiki/IETester/HomePageIETester is a free WebBrowser that allows you to have the rendering and javascript engines of IE8, IE7 IE 6 and IE5.5 on Vista and XP, as well as the installed IE in the same process.
2. MultiFirefox –
http://davemartorana.com/multifirefox/MultiFirefox is a small launcher utility that allows you to run multiple versions of Firefox side-by-side. It helps you set up multiple profiles…
3. Multi Safari –
http://michelf.com/projects/multi-safari/These special versions of Safari use the original Web Kit framework that came with them, bundled inside the application. They will mimic original Safari rendering and javascript behaviours. …
happy testing