$('document').ready(function(){
  fadeInSpeed = 550;
  fadeOutSpeed = 150;
  timerSpeed = 6000;
  old_index = 1;
  new_index = 0;
  max_index = $('#shw_img a').length;
  
  timer = setInterval(function(){rotateImg(old_index+1)}, timerSpeed);   
  
  $('#menu_l li').mouseover(function(){
    new_index = $('#menu_l li').index(this)+1;
    clearInterval(timer);
    if(new_index!=old_index){
      rotateImg(new_index);
    }
  });
  $('#menu_l li').mouseout(function(){
    timer = setInterval(function(){rotateImg(old_index+1)}, timerSpeed); 
  });
  
  
  function rotateImg(nindex){
    if(nindex > max_index)
      nindex = 1;
    oindex = old_index-1;
    $('#shw_img a').eq(nindex-1).fadeIn(fadeInSpeed);
    $('#shw_img a').eq(oindex).fadeOut(fadeOutSpeed);
    $('#menu_l li a').eq(nindex-1).attr('class', 'linka_act');
    $('#menu_l li a').eq(oindex).attr('class', 'linka');
    old_index = nindex;
  }
    
});