appel de fonction javascript qui ne marche qu'une fois...

function insertNewOption(selectElement, newOption) {
	var optsLen = $(selectElement).options.length;
	$(selectElement).options[optsLen] = newOption;
	return optsLen;
}

function removeOption(selectId, optionValue) {
	var oOptions = $(selectId).getElementsByTagName('option');
	var taille = oOptions.length;
	for(i=0; i < taille; i++) { 
		if (oOptions[i].value == optionValue) {
			Element.remove(oOptions[i]);
			throw $break;
		}
	}
}

function updateOption(selectId, optionValue, optionNewText) {
	var oOptions = $(selectId).getElementsByTagName('option');
	var taille = oOptions.length;
	for(i=0; i < taille; i++) { 
		if (oOptions[i].value == optionValue) {
			oOptions[i].text = optionNewText;
			throw $break;
		}
	}
}

switch($_POST['sFolderAction']) {
	case 'new':
		$idNewFolder = MessageFolder::newFolder($idUser, $_POST['sFolderName']);
		if (!empty($idNewFolder)) {
			echo 'Le dossier ', $_POST['sFolderName'], ' a été créé.';
			?>
			<script type="text/javascript">
		   		insertNewOption(
				   		'selectFolderUpdate', 
				   		new Option("<?php echo $_POST['sFolderName']; ?>", "<?php echo $idNewFolder; ?>"));
		   		insertNewOption(
				   		'selectFolderDelete', 
				   		new Option("<?php echo $_POST['sFolderName']; ?>", "<?php echo $idNewFolder; ?>"));
			</script>
			<?php
		}
		break;
	case 'update':
		if (MessageFolder::updateFolder($_POST['idFolder'], $_POST['sFolderName'])) {
			echo 'Le dossier ', $_POST['sFolderName'], ' a bien été renommé.';
			?>
			<script type="text/javascript">
				updateOption(
					'selectFolderUpdate', 
					'<?php echo $_POST['idFolder']; ?>', 
					'<?php echo $_POST['sFolderName']; ?>'
				);
				updateOption(
					'selectFolderDelete', 
					'<?php echo $_POST['idFolder']; ?>', 
					'<?php echo $_POST['sFolderName']; ?>'
				);
			</script>
			<?php
		}
		break;
	case 'delete':
		$sFolderName = MessageFolder::getFolderName($_POST['idFolder']);
		MessageFolder::deleteFolder($_POST['idFolder']);
		echo 'Le dossier ', $sFolderName, ' a été supprimé.';
		?>
		<script type="text/javascript">
			removeOption(
				'selectFolderUpdate', 
				'<?php echo $_POST['idFolder']; ?>'
			);
			removeOption(
				'selectFolderDelete', 
				'<?php echo $_POST['idFolder']; ?>'
			);
		</script>
		<?php
		break;
	}

Le dossier testInsert$$ a bien été renommé.			<script type="text/javascript">
				updateOption(
					'selectFolderUpdate', 
					'4', 
					'testInsert$$'
				);
				updateOption(
					'selectFolderDelete', 
					'4', 
					'testInsert$$'
				);
			</script>

<div id="divFolderManager">
	<h2>Gestion des dossiers</h2>
	<hr class="white" />
	<br />
	<span id="msgFolderManagerNotification"></span>
	<br />
	<br />
	<form action="#" id="msgFolderManagerForm">
		<span id="newFolderSpan" class="folderManagerSpan">
			<label for="newFolderInuput">
				Créer un nouveau dossier
			</label>
			<input type="text" id="newFolderInput" />
			<input type="button" id="newFolderSubmit" value="Créer" />	
		</span>
		<hr class="grey" />
		<span id="folderUpdateSpan" class="folderManagerSpan">
			<label for="selectFolderUpdate">
				Renommer le dossier
			</label>
			{__SELECT_FOLDER_UPDATE__}
			<label for="updateFolderInput">
				pour
			</label>
			<input type="text" id="updateFolderInput" />
			<input type="button" id="updateFolderSubmit" value="Enregistrer" />	
		</span>
		<hr class="grey" />
		<span id="folderDeleteSpan">
			<label for="selectFolderDelete">
				Supprimer le dossier
			</label>
			{__SELECT_FOLDER_DELETE__}
			<input type="button" id="deleteFolderSubmit" value="Supprimer" />
			Attention !
			<br />
			Cette action supprimera tous les messages contenus dans ce dossier.
		</span>
	</form>
	<br />
	<br />
</div>
<script type="text/javascript">
new Event.observe("newFolderSubmit","click", function(evt) {
	new Ajax.Updater('msgFolderManagerNotification', "{__AJAX_PATH__}msgFolderManager.ajax.php", {
		method : 'post',
		parameters : "sFolderAction=new&sFolderName="+ $('newFolderInput').value,
		evalScripts : true,
		onSuccess : function() {
			$('newFolderInput').value = '';
		}
	});
});
new Event.observe("selectFolderUpdate","change", function(evt) {
	$("updateFolderInput").value = $("selectFolderUpdate").options[$("selectFolderUpdate").selectedIndex].text;
	$("updateFolderInput").focus();
});
new Event.observe("updateFolderSubmit","click", function(evt) {
	new Ajax.Updater('msgFolderManagerNotification', "{__AJAX_PATH__}msgFolderManager.ajax.php", {
		method : 'post',
		parameters : "sFolderAction=update&idFolder="+ $('selectFolderUpdate').value + "&sFolderName=" + $('updateFolderInput').value,
		evalScripts : true,
		onSuccess : function() {
			$('updateFolderInput').value = '';
			$('selectFolderUpdate').value = '';
		}
	});
});
new Event.observe("deleteFolderSubmit","click", function(evt) {
	new Ajax.Updater('msgFolderManagerNotification', "{__AJAX_PATH__}msgFolderManager.ajax.php", {
		method : 'post',
		parameters : "sFolderAction=delete&idFolder="+ $('selectFolderDelete').value,
		evalScripts : true,
		onSuccess : function() {
			$('selectFolderDelete').value = '';
		}
	});
});
</script>

var oOptions = $(selectId).getElementsByTagName('option');

var oOptions = $(selectId).options;