var tl_timer = 0;

function timeline_showdate(selected, current) {
  var J = $$('div.tl')
  for(var i=0;i<J.length;++i){
    J[i].style.visibility = "hidden"
  }
  $(selected).style.visibility= "visible"
  $clear(tl_timer)
}

function timeline_hidedate(selected, current) {
  tl_timer = (function(c){
    var J = $$('div.tl')
    for(var i=0;i<J.length;++i){
      J[i].style.visibility = "hidden"
    }
    $(c).style.visibility= "visible"
  }).delay(500,1,current)
}