// gestion de l'index des produits  (30 produits Max )
function modifZIndex(id){
   if (document.getElementById) {
      var zIndex=parseInt(document.getElementById(id).style.zIndex); 
      //document.getElementById('prod0').style.zIndex=0;
      document.getElementById('prod1').style.zIndex=0;
      document.getElementById('prod2').style.zIndex=0;
      document.getElementById('prod3').style.zIndex=0;
      document.getElementById('prod4').style.zIndex=0;
      document.getElementById('prod5').style.zIndex=0;
      document.getElementById('prod6').style.zIndex=0;
      document.getElementById('prod7').style.zIndex=0;
      document.getElementById('prod8').style.zIndex=0;
      document.getElementById('prod9').style.zIndex=0;
      document.getElementById('prod10').style.zIndex=0;
      document.getElementById('prod11').style.zIndex=0;
      document.getElementById('prod12').style.zIndex=0;
      document.getElementById('prod13').style.zIndex=0;
      document.getElementById('prod14').style.zIndex=0;
      document.getElementById('prod15').style.zIndex=0;
      document.getElementById('prod16').style.zIndex=0;
      document.getElementById('prod17').style.zIndex=0;
      document.getElementById('prod18').style.zIndex=0;
      document.getElementById('prod19').style.zIndex=0;
      document.getElementById('prod20').style.zIndex=0;
      document.getElementById('prod21').style.zIndex=0;
      document.getElementById('prod22').style.zIndex=0;
      document.getElementById('prod23').style.zIndex=0;
      document.getElementById('prod24').style.zIndex=0;
      document.getElementById('prod25').style.zIndex=0;
      document.getElementById('prod26').style.zIndex=0;
      document.getElementById('prod27').style.zIndex=0;
      document.getElementById('prod28').style.zIndex=0;
      document.getElementById('prod29').style.zIndex=0;
      document.getElementById('prod30').style.zIndex=0;
      document.getElementById(id).style.zIndex=1;
   }
   }  ;