function champs_ok(){



//check si PIEGE renseigné
  if (document.form_contacts.piege.value != '')
   {  alert("ROBOT");
     return false; }

//check si CIVILITE renseigné
  if (document.form_contacts.civil.value == 0)
   {  alert("Please indicate your form of address.");
     return false; }

//check si ACTIVITé renseigné
  else if (document.form_contacts.activ.value == 0 && document.form_contacts.theme.value != 'Unsolicited candidature')
   {  alert("Please indicate your activity.");
     return false; }

//check si NOM renseigné
 else if (document.form_contacts.nom.value == 0)
   {  alert("Please indicate your surname.");
     return false; }

//check si PRENOM renseigné
 else if (document.form_contacts.prenom.value == 0)
   {  alert("Please indicate your first name.");
     return false; }

//check si CP renseigné
  else if (document.form_contacts.cp.value == 0)
   {  alert("Vous devez indiquer votre post code.");
     return false; }

//check si PAYS renseigné
 else  if (document.form_contacts.pays.value == 0)
   {  alert("Please indicate your country.");
     return false; }

//check si EMAIL renseigné
 else if(validation()==false) { alert("This e-mail address is invalid.. "); return false;}

//check si SUJET renseigné
 else  if (document.form_contacts.theme.value == 0)
   {  alert("Please indicate a subject.");
     return false; }
	 
	 //check si PRODUIT renseigné
 else  if (document.form_contacts.theme.value == 'Product information'   && document.form_contacts.prod.value == 0)
   {  alert("Please indicate a product.");
     return false; }

//check si MESSAGE renseigné
  else if (document.form_contacts.txt.value == 0)
   {  alert("Please write a message.");
     return false; }

 else{ 
  document.form_contacts.action = "confirmation-of-your-message"; 
document.form_contacts.submit() ; 
 }

}//champs_ok()

function validation(){
var email = document.form_contacts.mail.value;
  var verif = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
if (verif.exec(email) == null){
return false;
}
}