function show_infobox() {
  obj = document.getElementById('slider');
  var pY = window.pageYOffset;
/*  if (obj.style.visibility == "hidden") {
   obj.style.visibility = "visible";
   obj.style.top = pY+200+"px";
   for (var i=0;i<11;i++) {
    setTimeout('setOpacity('+i+')',100*i);
   }
   setTimeout('show_infobox()',1000);
  } else {
   for (var i=11;i=0;i--) {
    setTimeout('setOpacity('+i+')',100*i);
   }
   obj.style.visibility = "hidden";
  }*/
 }

function hide_box() {
  obj = document.getElementById('slider');
   for (var i=11;i=0;i--) {
    setTimeout('setOpacity('+i+')',100*i);
  }
  setTimeout('show_infobox()',1000);
  obj.style.visibility = "hidden";
}

function setOpacity(value) {
  obj = document.getElementById('slider');
  obj.style.opacity = value/10;
  obj.style.filter = 'alpha(opacity=' + value*10 + ')';
}