Javascript style variables with "-" in their name aren't able to be changed?

Posted by William on Stack Overflow See other posts from Stack Overflow or by William
Published on 2010-06-13T23:51:25Z Indexed on 2010/06/13 23:52 UTC
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Okay, so this bug has cost me quite a bit of time and embarrassment. It seems that any style variable with a - in it's name can't be modified by javascript.

As seen here:

<!DOCTYPE html>
<html lang="en">
    <head>
        <title>Class Test</title>
        <meta charset="utf-8" />
        <style>
            body { text-align: center; background-color: #ffffff;}
            #box { position: absolute; left: 610px; top: 80px; height: 50px; width: 50px; background-color: #ff0000; color: #000000;}
        </style>

        <script type="text/javascript">
            var box = 0;
        </script>
    </head>

    <body>
        <div id="box" ></div> 
        <script type="text/javascript">
            box = document.getElementById('box');
            box.style.background-color = "#0000ff";
        </script>

    </body>
</html>

The box in said example will just remain red.

So how do I change a style variable with a - in it's name?

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