Accepted answer

Those dangling commas are causing errors in Internet Explorer. Get rid of them.

Here's an example:

    chart: {
        renderTo: 'company_chart', // <--- get rid of that comma

Internet Explorer considers a comma at the end of an object literal like that to be an error. You should in fact be seeing the "Errors on page" warning, but the error is usually something that does not indicate this actual root cause.

edit — well apparently IE8 is not picky about that, though IE7 is.

edit againHowever, IE8 interprets that last dangling comma in your data arrays as meaning that there should be an extra element! In other words:

 [1, 2, 3,].length

is 3 in Firefox/Chrome/Safari but it's 4 in Internet Explorer. When you try to access that element, the browser gives you undefined.

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