var browserOK = false;
var pics;
browserOK = true;
pics = new Array();
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/avto.png", "images/avto_push.png");
preload("link2", "images/service.png", "images/service_push.png");
preload("link3", "images/parts.png", "images/parts_push.png");
preload("link4", "images/news.png", "images/news_push.png");
preload("link5", "images/contacts.png", "images/contacts_push.png");
preload("link6", "images/zf.png", "images/zf_push.png");