function FamilleParMarque(f){
  var l1    = f.elements["rech_marque"]; 
  var l2    = f.elements["rech_categorie"];
  
  var index = l1.selectedIndex;
  
  //if(index < 1) l2.options.length = 0; 
  //else { 
    var xhr_object = null; 
  	     
    if(window.XMLHttpRequest) // Firefox 
      xhr_object = new XMLHttpRequest(); 
    else if(window.ActiveXObject) // Internet Explorer 
      xhr_object = new ActiveXObject("Microsoft.XMLHTTP"); 
    else { // XMLHttpRequest non supporté par le navigateur 
      alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
      return; 
    } 
  	 
    xhr_object.open("POST", "./util/php/Ajax/traite_mqrech.php", true); 
       
    xhr_object.onreadystatechange = function() { 
        if(xhr_object.readyState == 4) 
        eval(xhr_object.responseText); 
      } 
   
    xhr_object.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    var data = "mq="+escape(l1.options[index].value)+"&fam="+l2.value+"&formulaire="+f.name+"&select=rech_categorie"; 
    xhr_object.send(data); 
  //} 
}

function MarqueParFamille(f){
  var l1    = f.elements["rech_categorie"]; 
  var l2    = f.elements["rech_marque"];
  
  var index = l1.selectedIndex;
  
  //if(index < 1) l2.options.length = 0; 
  //else { 
    var xhr_object = null; 
  	     
    if(window.XMLHttpRequest) // Firefox 
      xhr_object = new XMLHttpRequest(); 
    else if(window.ActiveXObject) // Internet Explorer 
      xhr_object = new ActiveXObject("Microsoft.XMLHTTP"); 
    else { // XMLHttpRequest non supporté par le navigateur 
      alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
      return; 
    } 
  	 
    xhr_object.open("POST", "./util/php/Ajax/traite_famrech.php", true); 
       
    xhr_object.onreadystatechange = function() { 
        
        if(xhr_object.readyState == 4)
        eval(xhr_object.responseText);
        
      } 
    
    xhr_object.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    var data = "fam="+l1.options[index].value+"&formulaire="+f.name+"&marque="+l2.value+"&select=rech_marque"; 
    
    xhr_object.send(data);
  //} 
}