// validation du format d'email
	function validEmail(strEmail){
          var pattern = '^[a-z0-9][a-z0-9._-]+[a-z0-9]@[a-z0-9][a-z0-9._-]+[a-z0-9]{2,}\.[a-z]{2,4}$';
          var maRegex = new RegExp(pattern);
          var  validation = maRegex.test(strEmail);
          return validation;
    }
    
// validation du format numerique
	function formatNumeric(str){
          var pattern = '^[0-9]+$';
          var maRegex = new RegExp(pattern);
          var validation = maRegex.test(str);
          return validation;
    }