Charger et changer du background du site

Tu dois t'aider avec javascript pour cela

Code:

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Document sans nom</title>
<script type="text/javascript">
function change_background(color)
{
	document.getElementById('body').style.background=color;
}
</script>
</head>
 
<body id="body">
<input type="button" value="Rouge"  onclick="change_background('#FF0000');" />
<input type="button" value="vert"  onclick="change_background('#00FF00');" />
<input type="button" value="bleu"  onclick="change_background('#0000FF');" />
</body>
</html>