function VerifForm(id_article)
		{
			adresse = document.getElementById("mail"+id_article).value;
			var place = adresse.indexOf("@",1);
			var point = adresse.indexOf(".",place+1);
			if ((place > -1)&&(adresse.length >2)&&(point > 1))
			{
				return true;
			}else{
				alert ("Votre adresse email est incorrecte.");
				document.getElementById("mail"+id_article).style.backgroundColor="#ffb0b0";
				return false;
				if (adresse!="") {
					alert ("Votre adresse email est incorrecte.");
					document.getElementById("mail"+id_article).style.backgroundColor="#ffb0b0";
					return false;
				}

			}
		}
		
		function test_champs(id_article){
			error=0;
			document.getElementById("nom"+id_article).style.backgroundColor="#ffffff";
			document.getElementById("prenom"+id_article).style.backgroundColor="#ffffff";
			document.getElementById("mail"+id_article).style.backgroundColor="#ffffff";
			document.getElementById("message"+id_article).style.backgroundColor="#ffffff";
			if (document.getElementById("nom"+id_article).value == "" ) {
				document.getElementById("nom"+id_article).style.backgroundColor="#ffb0b0";
				error=1;
			}
			if (document.getElementById("prenom"+id_article).value == "" ) {
				document.getElementById("prenom"+id_article).style.backgroundColor="#ffb0b0";
				error=1;
			}
			if (document.getElementById("message"+id_article).value == "" ) {
				document.getElementById("message"+id_article).style.backgroundColor="#ffb0b0";
				error=1;
			}
			if (document.getElementById("mail"+id_article).value == "" ) {
				document.getElementById("mail"+id_article).style.backgroundColor="#ffb0b0";
				error=1;
			} else {
				if ( VerifForm() == false ) { error=2; }
			}
			
			if ( error == 1 ) {
				alert('Vous devez remplir tous les champs.');
				return false;
			} else {
				if ( error == 2 ) {
					return false;
				} else {
					return true
				}
			}
		}