Somewhere in 2012 the Internet Explorer 6 is still used.
I had to check my app on this browser because the emulator (IE Tester) didn’t found the error. First I had to downgrade IE8 to IE6 on a pc (with Windows XP).

The solution:

1. %windir%ie8spuninstspuninst.exe
2. Click Start, and then click Run.
3. In the Open box, type Cmd.exe, and then press ENTER.
4. Right-click inside the Cmd.exe window, and then click Paste to paste the command that you copied in step 1.
5. Press ENTER to uninstall Internet Explorer 8.
6. When the uninstall program is finished, restart your computer.

Now I have IE6. 🙂

http://answers.microsoft.com/en-us/ie/forum/ie8-windows_xp/downgrade-ie8-to-ie6-is-this-possible/0c860b0d-0ac1-42a6-9369-841a507fb1cc