bloquer les boutons radios

Salut,

bien sur qu'il y a moyen :) :
Code:
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<html>
	<script type="text/javascript">
		function disable_radios()
		{
			for (var i=0; i<form1.elements.length; i++) {
				if (form1.elements[i].name == 'radio_name') {
					form1.elements[i].disabled = true;
				}
			}
		}
	</script>
	<body>
 
		<form action="file2.php" method="post" name="form1">
			<input type="text" name="prout_hidden" value="prout" />
 
			<input type="radio" name="radio_name" value="one" onclick="disable_radios();" />
			<input type="radio" name="radio_name" value="two" onclick="disable_radios();"/>
			<input type="radio" name="radio_name" value="three" selected onclick="disable_radios();" />
 
 
			<input type="submit" value="soumettre" />
		</form>
	</body>
</html>