Here is a look at the script. See if you can trace how it works.

<HTML>

<HEAD>
    <SCRIPT LANGUAGE="JavaScript">
        <!-- Beginning of JavaScript -

        function changecolor(code) {

            document.bgColor = code
        }
        // - End of JavaScript - -->
    </SCRIPT>

</HEAD>

<BODY>

    <form>
        <input type="button" name="Button1" value="RED" onclick="changecolor('red')">

        <input type="button" name="Button2" value="GREEN" onclick="changecolor('green')">

        <input type="button" name="Button3" value="BLUE" onclick="changecolor('blue')">

        <input type="button" name="Button4" value="WHITE" onclick="changecolor('white')">

    </form>

</BODY>

</HTML>

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