function pre()
  {
  var counter = 0
  var img = new Array();
  
  for (var k1=0;k1<2;k1++)
    {
    for (var k2=0;k2<2;k2++)
      {
      for (var k3=0;k3<2;k3++)
        {
        for (var k4=0;k4<2;k4++,counter++)
          {
          img[counter] = new Array();
          img[counter][0] = new Image();
          img[counter][1] = new Image();
          img[counter][2] = new Image();
          
          img[counter][0].src = "items/a"+k1+k2+k3+k4+"a.gif"
          img[counter][1].src = "items/a"+k1+k2+k3+k4+"b.gif"
          img[counter][2].src = "items/a"+k1+k2+k3+k4+"c.gif"
          if (k1+k2+k3+k4==1)
            {
            img[counter][3] = new Image();
            img[counter][4] = new Image();
            img[counter][5] = new Image();
            img[counter][6] = new Image();
            img[counter][7] = new Image();
            img[counter][8] = new Image();
            
            img[counter][3].src = "items/e"+k1+k2+k3+k4+"a.gif"
            img[counter][4].src = "items/e"+k1+k2+k3+k4+"b.gif"
            img[counter][5].src = "items/e"+k1+k2+k3+k4+"c.gif"
            img[counter][6].src = "items/s"+k1+k2+k3+k4+"a.gif"
            img[counter][7].src = "items/s"+k1+k2+k3+k4+"b.gif"
            img[counter][8].src = "items/s"+k1+k2+k3+k4+"c.gif"
            }
          } 
        }
      }
    }
  }