[JavaScript] Activer/Désactiver des champs da

<?php
include_once("squelette.php");
$monSquelette = new CSquelette;
$monSquelette->fctDoctype();
$monSquelette->fctTitleDescriptionKeywords("leTitre","laDescription","LesKeywords");
$monSquelette->fctFinMetaDebutBody();
?>
	<!-- La phrase d'intro est à remplir ici -->
	<p></p>
	
	<script type="text/javascript" src="invite.js"></script>
<?php
$monSquelette->fctFinHeader()
?>
	<!-- Le contenu est à rempli ici -->
	<div id="content">
	
			Your name : <input name="yourName" />			Your email : <input name="yourEmail" /><br /><br />
			Your message : <textarea rows="5" cols="20" name="yourMessage"></textarea>
			
		<div id="readroot" style="display: none">
			<input type="button" value="Remove review" onclick="this.parentNode.parentNode.removeChild(this.parentNode);" /><br /><br />
			Her/His name : <input name="herHisName" />			Her/His email : <input name="herHisEmail" /><br /><br />
		</div>

		<form method="post" action="/cgi-bin/show_params.cgi">

			<span id="writeroot"></span>
			<input type="button" id="moreFields" value="Add recipient" />
			<input type="submit" value="Send form" />
		</form>

	</div>
<?php
$monSquelette->fctPiedDePageEtFin();
?>

var counter = 0;

function moreFields() {
	counter++;
	var newFields = document.getElementById('readroot').cloneNode(true);
	newFields.id = '';
	newFields.style.display = 'block';
	var newField = newFields.childNodes;
	for (var i=0;i<newField.length;i++) {
		var theName = newField[i].name
		if (theName)
			newField[i].name = theName + counter;
	}
	var insertHere = document.getElementById('writeroot');
	insertHere.parentNode.insertBefore(newFields,insertHere);
}

window.onload = moreFields;