<form method="POST" name="background">
      <input type="button" value="green" onclick="document.bgColor='green'">
      <input type="button" value="blue" onclick="document.bgColor='blue'">
      <input type="button" value="orange" onclick="document.bgColor='orange'">
      <input type="button" value="gray" onclick="document.bgColor='gray'">
      <input type="button" value="red" onclick="document.bgColor='red'">
      <input type="button" value="yellow" onclick="document.bgColor='yellow'">
      <input type="button" value="black" onclick="document.bgColor='black'">
      <input type="button" value="white" onclick="document.bgColor='white'">
</form>