FInd Javascript Error In IE 7?

I had Put a digg button in my blog. The blog runs fine on firefox and opera,but when i open it in ie7 it shows javascript error.clicking on that little triangle doesn't show any information..how to remove that error?

From stackoverflow

• You should try the (free) Fiddler2 for Internet Explorer tool. It gives you a range of additional information for scripts and the background goings on of your code etc, might make it easier to find exactly what and where the error is.

  Rahul Vyas : ok i'll try it.thanks for the info

• Hi, try to search for Firebug Lite on Google. This is a version of Firebug that can be directly integrated into the webpage and allows so to have the great Firebug features also on IE. It may help to find your JavaScript problem.

• You have to find out what kind of exception it's throwing, I think, then you can start solving.
  If you have not an IE debugger in hand (IE8 has one), let's try alerting the isuue:

  ...
  try {
      //digg
  } catch(err) {
      alert(err.description);
  }
  ...