var currentSlideNumber = 0;
var slideInterval = 8000;
function but_on(ob_id) {
  document.getElementById("top_menutd_"+ob_id).style.backgroundImage='url("http://www.tlokh.ru/img/but_on.jpg")' ;
  document.getElementById("top_menu_"+ob_id).style.color='#ffffff';
}
function but_out(ob_id) {
  document.getElementById("top_menutd_"+ob_id).style.backgroundImage='url("http://www.tlokh.ru/img/but_off.jpg")';
  document.getElementById("top_menu_"+ob_id).style.color='#f3ac22';
}


function doTrans()
{
  slideCont.filters[0].apply();
  slideCont.children[currentSlideNumber].style.display = "none";
  slideCont.children[currentSlideNumber].style.visibility = "hidden";
  if (++currentSlideNumber >= slideCont.children.length)
  currentSlideNumber = 0;
  slideCont.children[currentSlideNumber].style.display = "";
  slideCont.children[currentSlideNumber].style.visibility = "visible";
  slideCont.filters[0].play();
}

window.setInterval("doTrans()",slideInterval);