var objCount = 0;
 function preload(name, first, second) {   
 if (browserOK)
 {     
  pics[objCount] = new Array(3);
  pics[objCount][0] = new Image();
  pics[objCount][0].src = first;
  pics[objCount][1] = new Image();
  pics[objCount][1].src = second;
  pics[objCount][2] = name;
  objCount++;
 }
}
function on(name)
{
 if (browserOK)
 {
  for (i = 0; i < objCount; i++)
  {
   if (document.images[pics[i][2]] != null)
    if (name != pics[i][2])
    { 
     document.images[pics[i][2]].src = pics[i][0].src;
    }
    else
    {
     document.images[pics[i][2]].src = pics[i][1].src;
    }
  }
 }
}

function off()
{
 if (browserOK)
 {
  for (i = 0; i < objCount; i++)
  {
   if (document.images[pics[i][2]] != null) 
   document.images[pics[i][2]].src = pics[i][0].src;
  }
 }
}
preload("link1", "images/buttons/img1f.jpg", "images/buttons/img1t.jpg");
preload("link2", "images/buttons/2-1.jpg", "images/buttons/2-2.jpg");
preload("link3", "images/buttons/3-1.jpg", "images/buttons/3-2.jpg");
preload("link4", "images/buttons/4-1.jpg", "images/buttons/4-2.jpg");
preload("ipoteka", "images/main_menu/01_ipo1.jpg", "images/main_menu/01_ipo2.jpg");
preload("link5", "images/main_menu/02_ipo1.jpg", "images/main_menu/02_ipo2.jpg");
preload("link6", "images/main_menu/03_jur1.jpg", "images/main_menu/03_jur2.jpg");
preload("link7", "images/main_menu/04_remont1.jpg", "images/main_menu/04_remont2.jpg");
preload("link8", "images/main_menu/05_diz1.jpg", "images/main_menu/05_diz2.jpg");