Debugging JavaScript in IE

You can use IE (by hitting F12 while in the browser) enter image description here

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Several options:

Open the IE developer tools (by hitting F12 while in the browser), and use the provided JavaScript debugger. To get to know it better, see the MSDN reference on using the JavaScript debugger (and a newer reference).
Install Debug Bar, which provides an extended feature-set to the built-in developer tools.
Install IE Tester, which emulates various IE instances (versions), and use its built-in Debug Bar. With that approach, you can also pin-point version-specific problems.

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