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Examples
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How to generate random colors in javascript with Example
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RandomColors
<html>
    <head>
        <style type="text/css">
            #magic_div {
               padding: 20px;
               display: inline-block;
               background-color: yellow;
            }
        </style>
        <script type="text/javascript">
            function colorIt(){
                var colorName = "rgb("+(Math.random()*255).toFixed()+","+(Math.random()*255).toFixed()+","+(Math.random()*255).toFixed()+")";
                document.getElementById('magic_div').style.backgroundColor = colorName;
            }
            window.onload = function(){
               setInterval("colorIt()",400);
            };
        </script>
    </head>
    <body>
        <div id="magic_div"></div>
    </body>
</html>
Demo & Output 
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