function checkform0 ( form ) { if (form.nom.value == "") {alert( "Champ obligatoire non renseigné" ); form.nom.focus(); return false ;}if (form.prenom.value == "") {alert( "Champ obligatoire non renseigné" ); form.prenom.focus(); return false ;}if (form.e_mail.value == "") {alert( "Champ obligatoire non renseigné" ); form.e_mail.focus(); return false ;} return true ; }