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+'px';
		elem.style.width = len+'px';
	}
}
function remove_loading() {
	this.clearInterval(t_id);
	var targelem = document.getElementById('loader_container');
	targelem.style.display='none';
	targelem.style.visibility='hidden';
}
function show_loading() {
	var t_id = setInterval(animate,20);
	var targelem = document.getElementById('loader_container');
	targelem.style.display='block';
	targelem.style.visibility='visible';
}