function verifie_form_contact(f)
{
	if(f.nom_prenom.value=="" || verifie_email(f.email.value)==false || f.message.value=="")
	{
		affiche_message_erreur("Vous devez remplir tous les champs du formulaire.");
		return false;
	}	
	return true;
}

function verifie_email(email)
{
	if(email == "")
		return false;
	var place = email.indexOf("@",1);
	var point = email.indexOf(".",place+1);
	if ((place > -1)&&(email.length >2)&&(point > 1))
		return true;
	else
		return false;	
}

function affiche_message_erreur(message,id_div)
{
	if(id_div==null)id_div='message_erreur';
	document.getElementById(id_div).style.display="";
	document.getElementById(id_div).innerHTML = message;
}

function cache_message_erreur(id_div)
{
	if(id_div==null)id_div='message_erreur';
	document.getElementById(id_div).style.display="none";	
}