var g_camping = new Image(); g_camping.src = "img/menu/camping_.jpg";  var g_hotel = new Image(); g_hotel.src = "img/menu/hotel_.jpg";  var g_restaurant = new Image(); g_restaurant.src = "img/menu/restaurant_.jpg";  var g_wellness = new Image(); g_wellness.src = "img/menu/wellness_.jpg";  



function imgOn(imgName)
{
  if( document.images )
  {
    document[imgName].src = eval( "g_" + imgName + ".src" );
  }
}
         

         
function imgOff(imgName)
{
  if( document.images )
  {
    document[imgName].src = "img/menu/" + imgName + ".jpg";
  }
}