Script Debugger

IE/Tools/Internet Options/Advanced/Disable Script Debugging and Display a notification about every script error.
Disable the Script Debugger in IE (Line 142)http://www.kellys-korner-xp.com/xp_tweaks.htm
How to Troubleshoot Script Errors in Internet Explorerhttp://support.microsoft.com/default.aspx?scid=KB;EN-US;q181698&

If you continue to get the errors after trying the above and/or the settings become unchecked, rename mdm.exe

When Internet Explorer detects an error on a page it has the ability to launch a script debugger to diagnose the problem. This setting controls the use of the Internet Explorer script debugging functions.
Go to Start/Run/Regedit and navigate to this key:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main

Create a new string value, or modify the existing value, named "Disable Script Debugger" and set it to either "yes" to disable the debugger or "no" to enable it. Restart Internet Explorer for the change to take effect.