How to print a number with commas as thousands separators in JavaScript

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I am trying to print an integer in JavaScript with commas as thousands separators. For example, I want to show the number 1234567 as “1,234,567”. How would I go about doing this?

Here is how I am doing it:

function numberWithCommas(x) {
    x = x.toString();
    var pattern = /(-?\d+)(\d{3})/;
    while (pattern.test(x))
        x = x.replace(pattern, "$1,$2");
    return x;
}

Is there a simpler or more elegant way to do it? It would be nice if it works with floats also, but that is not necessary. It does not need to be locale-specific to decide between periods and commas.

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