Internet Explorer has an option to disable script debugging. If you try to debug your javascript, and this option in IE is enabled, you’ll get the following warning message:

Script debugging warning message

If you want to hide (or show) this warning, go to Tools – Options – Debugging – General, and check the “Warn if script debugging is disabled on launch”

Warn if script debugging is disabled on launch option

I believe this is for VS2008 only.

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