function matchRegularExpression(valeur, regularExpression) {
	var resultat = valeur.match(regularExpression);
	if(resultat!=null && resultat.length==1) return true;
	else return false;
}

function checkFormEmail(div) {
	var erreurForm = 0;
	var regExpEmailAdress=/^[A-Za-z0-9](([_\.\-]?[a-zA-Z0-9]+)*)@([A-Za-z0-9]+)(([\.\-]?[a-zA-Z0-9]+)*)\.([A-Za-z]{2,})$/g;
	
	if (!matchRegularExpression(div.value, regExpEmailAdress)) {
		div.value='no valid mail';
		erreurForm++;
	}
	
	if (erreurForm==0) return true;
	else return false;

}