Code:
<html>
<head>
<SCRIPT LANGUAGE="JavaScript">
function BgColor (color) {
document.bgColor=color }
</SCRIPT>
</head>
<body>
<form>
<input type="button" name="redbutton" value="Red" onClick="changecolor ('red')">
<input type="button" name="bluebutton" value="Blue" onClick="changecolor ('blue')">
<input type="button" name="greenbutton" value="Green" onClick="changecolor ('green')">
</form>
</body>
</html>

