function check_input(){ 
   var message_alert = ""; 
   var i = 0;
   while(i<11)
   {
	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 = "#FFFFFF";
		if(rechRapide == "") { 
			window.document.forms[0].elements[i].focus(); 
			window.document.forms[0].elements[i].style.backgroundColor = "#CCCCCC"; 
			message_alert +=" Veuillez remplir le champ " + nom_champ +"\n"; 
		} 
	i = i+1;
   } 
   if (message_alert == "") { 
         return true; 
      } else { 
         message_alert = "Informations omises dans le formulaire : \n" + message_alert; 
         alert(message_alert); 
         return false; 
         } 
		 
		 
}