var W3CDOM = (document.getElementsByTagName && document.createElement);

function valider() {
	validForm = true;
	firstError = null;
	errorstring = '';
	var lesChamps = document.forms['formMembre'];
	if (lesChamps['genre'].value == 'Sélectionnez')	writeError(lesChamps['genre'],'  Choisissez');
	if (lesChamps['statut'].value == 'Sélectionnez')	writeError(lesChamps['statut'],'  Choisissez');
	if (lesChamps['nom'].value == '') writeError(lesChamps['nom'],'  Complétez');
	if (lesChamps['prenom'].value == '') writeError(lesChamps['prenom'],'  Complétez');
	if (lesChamps['mobile'].value == '') writeError(lesChamps['mobile'],'  Complétez');
	if (lesChamps['email'].value == '') writeError(lesChamps['email'],'  Complétez');
	if (!W3CDOM)
		alert(errorstring);
	if (firstError)
		firstError.focus();
	if (validForm)
	return true;
}
function writeError(obj,message) {
	validForm = false;
	if (obj.hasError) return;
	if (W3CDOM) {
		obj.className += ' erreur';
		obj.onchange = removeError;
		var span = document.createElement('span');
		span.className = 'erreur';
		span.appendChild(document.createTextNode(message));
		obj.parentNode.appendChild(span);
		obj.hasError = span;
	}
	else {
		errorstring += obj.name + ': ' + message + '\n';
		obj.hasError = true;
	}
	if (!firstError)
		firstError = obj;
}
function removeError() {
	this.className = this.className.substring(0,this.className.lastIndexOf(' '));
	this.parentNode.removeChild(this.hasError);
	this.hasError = null;
	this.onchange = null;
}