if (document.images) {

// On images        

        image1on = new Image();
        image1on.src = "images/bout/onglet-lentilles2.gif";

        image2on = new Image();
        image2on.src = "images/bout/onglet-produits2.gif";

        image3on = new Image();
        image3on.src = "images/bout/onglet-packs2.gif";

        image4on = new Image();
        image4on.src = "images/bout/onglet-archives2.gif";

        image5on = new Image();
        image5on.src = "images/bout/onglet-forum2.gif";


// Off images

        image1off = new Image();
        image1off.src = "images/bout/onglet-lentilles1.gif";

        image2off = new Image();
        image2off.src = "images/bout/onglet-produits1.gif";

        image3off = new Image();
        image3off.src = "images/bout/onglet-packs1.gif";

        image4off = new Image();
        image4off.src = "images/bout/onglet-archives1.gif";

        image5off = new Image();
        image5off.src = "images/bout/onglet-forum1.gif";     
  }

function act(imgName, imgNum) {
    if (document.images)
         document[imgName].src = eval(imgName + 'on.src')
}

function inact(imgName) {
   if (document.images)
        document[imgName].src = eval(imgName + 'off.src')
}