var preloadAll = false;

function preloadImages() {
  if (document.images) {
    homeIn = new Image(); homeIn.src = 'images/home1.gif';
    homeAc = new Image(); homeAc.src = 'images/home2.gif';
    biographyIn = new Image(); biographyIn.src = 'images/curriculum1.gif';
    biographyAc = new Image(); biographyAc.src = 'images/curriculum2.gif';
    operaRepIn = new Image(); operaRepIn.src = 'images/rep_operistico1.gif';
    operaRepAc = new Image(); operaRepAc.src = 'images/rep_operistico2.gif';
    symphonicRepIn = new Image(); symphonicRepIn.src = 'images/rep_sinfonico1.gif';
    symphonicRepAc = new Image(); symphonicRepAc.src = 'images/rep_sinfonico2.gif';
    reviewsIn = new Image(); reviewsIn.src = 'images/hannodetto1.gif';
    reviewsAc = new Image(); reviewsAc.src = 'images/hannodetto2.gif';
    discographyIn = new Image(); discographyIn.src = 'images/discografia1.gif';
    discographyAc = new Image(); discographyAc.src = 'images/discografia2.gif';
    contactsIn = new Image(); contactsIn.src = 'images/contatti1.gif';
    contactsAc = new Image(); contactsAc.src = 'images/contatti2.gif';

    preloadAll = true;
  }
}

function active(imgName) {
  if (document.images && (preloadAll == true)) {
    img = eval(imgName + "Ac.src");
    document[imgName].src = img;
  }
}

function inactive(imgName) {
  if (document.images && (preloadAll == true)) {
    img = eval(imgName + "In.src");
    document[imgName].src = img;
  }
}