// 页面加载未完成之前显示的loading效果
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';
}