To help your web developer resolve script problems - try turning off "Friendly HTTP Error Messages".
To do this in Internet Explorer 7.0
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Click on tools -> "Internet Options"
Note on Internet Explorer 6 - the "Tools" menu is location where menus normally are.

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Click on the "Advanced" tab

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Scroll down and tick off "Show Friendly HTTP error messages"

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Click "Apply"
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Click "Ok"