var t_id = setInterval(animate,20);
var pos = 0;
var dir = 2;
var len = 0;

function animate() {
  var elem = document.getElementById('progress');
  if(elem != null) {
    if (pos==0) len += dir;
    if (len>32 || pos>79) pos += dir;
    if (pos>79) len -= dir;
    if (pos>79 && len==0) pos=0;
    elem.style.left = pos;
    elem.style.width = len;
  }
}

function remove_loading() {
  this.clearInterval(t_id);
  var targelem = document.getElementById('loader_container');
  targelem.style.display='none';
  targelem.style.visibility='hidden';
  var t_id = setInterval(animate,60);
}