function check_input(){
   var message_alert = "";
   for(var i = 0; i < window.document.forms[0].length ; i++) {
      var rechRapide = window.document.forms[0].elements[i].value;
      var nom_champ = window.document.forms[0].elements[i].name;
      window.document.forms[0].elements[i].style.backgroundColor = "#333333";
      if(rechRapide == "") {
         window.document.forms[0].elements[i].focus();
         window.document.forms[0].elements[i].style.backgroundColor = "#838383";
         message_alert +="Remplissez le formulaire SVP\n";
      }
   }
   if (message_alert == "") {
         return true;
      } else {
         message_alert = "Des informations sont manquantes\n" ;
         alert(message_alert);
         return false;
         }
}

function check_input2(){     
   var err=0;
   var f=window.document.forms[0];    
   for(var i = 0; i < f.length ; i++) {     
     if(f[i].type=='text'&&f[i].value==''){
     			
     			 f[i].style.backgroundColor = "#89A1BD";
     			 if(err==0)f[i].focus();    
     			 err++; 	
     } 
     else if(f[i].type=='checkbox'&&!f[i].checked  ){
     			 if(err==0)f[i].focus();    
     			 err++; 
     			
    }
   }   
   if(err){
   			alert("Informations are missing" );	
   			return false;
   }
   return true; 
}