JavaScript Program to Change Background Color of Webpage on Radio button selection

Write a JavaScript program to change background color of webpage on selection using radio buttons.

Source Code
    <title>Radio button change background color</title>
    function changeColor(color)
        var panel = document.getElementById('panel') = color
        panel.innerHTML = "Background color is set to: " + color.toUpperCase()

<body onload="changeColor('red')">
<p>Select option to change background color of page</p>
<form name="myform">
    <input type="radio" name="color" value="red" onchange="changeColor(this.value)" checked="false">RED<br/>
    <input type="radio" name="color" value="green" onchange="changeColor(this.value)">GREEN<br/>
    <input type="radio" name="color" value="blue" onchange="changeColor(this.value)">BLUE<br/>
<p id="panel"></p>