Untitled

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>

<button id="myButton">Press button</button>
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script>
    $('#myButton').on('click', setBackground);

    function setBackground() {
        window.setTimeout(setBackground, 1500);

        var index = Math.round(Math.random() * 10);

        var ColorValue = "FFFFFF";

        if (index == 1) ColorValue = "003366";
        if (index == 2) ColorValue = "660066";
        if (index == 3) ColorValue = "FF0000";
        if (index == 4) ColorValue = "FFFF66";
        if (index == 5) ColorValue = "99FF33";
        if (index == 6) ColorValue = "00CC00";
        if (index == 7) ColorValue = "666633";
        if (index == 8) ColorValue = "3D9999";
        if (index == 9) ColorValue = "143333";
        if (index == 10) ColorValue = "1A1A80";

        $("body").css('backgroundColor', "#" + ColorValue);
    }
</script>
</body>
</html>