javascript function calling

In the following example, three functions are called against three buttons with type=”button”

<!DOCTYPE html>
  <meta charset="utf-8" />

    <script language="javascript" type="text/javascript">
        function redColor()
            document.bgColor = "red";

        function blueColor()
            document.bgColor = "blue";

        function greenColor()
            document.bgColor = "green";

<input id="btn1" name="btn1" type="button" value="Red" onclick="redColor();" /><br /><br />
<input id="btn2" name="btn2" type="button" value="Green" onclick="greenColor();" /><br /><br />
<input id="btn3" name="btn3" type="button" value="Blue" onclick="blueColor();"  /><br /><br />


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