function verif() {
  
         var err = 0;
  
         var fields = new Array('nom', 'email', 'message');
  
       
  
         for(var i=0; i<fields.length; i++){
  
           if(document.getElementById(fields[i]).value == '') {
 
             document.getElementById("label_"+fields[i]).className = 'error';
  
             err++;
  
           } else {
 
             document.getElementById("label_"+fields[i]).className = 'juste';
 
           }
 
         }
  
       
 
         if( validerEmail('email') ) {
 
           document.getElementById("label_email").className = 'juste';
 
         } else {
  
           document.getElementById("label_email").className = 'error';
  
           err++;
 
         }
  
       
 
        return ! err;
  
       
  
       }
  
       
  
       function validerEmail(idInput) {
  
         if (!document.getElementById(idInput).value.match(/^[\w\.\-]+@([\w\-]+\.)+[a-zA-Z]+$/)) {
  
           return false;
  
         }
  
         return true;
  
       }