go to this link
http://tredosoft.com/Multiple_IE
it tell you how to use multiple IE on the same computer. We used that to test our web applications with IE 5+. useful.
2008/10/31 Anissa Lam <Anissa.Lam@sun.com>
Hi Kana,
This is not a known issue, at least not for me. The problem is, once i install IE 7 on my PC, I wasn't able to install/run IE 6 anymore. So, all my testing is on IE7. Once I can get hold of a machine with IE 6, I will take a look.
Feel free to find an issue on this.
thanks
Anissa