function() {

	function $(id) {
		return document.getElementById(id);
	}
	
	function setStyleDisplay(id, status) {
		$(id).style.display = status;
	}
	
	function goTop(acceleration, time) {
		acceleration = acceleration || 0.1;
		time = time || 16;
	
		var dx = 0;
		var dy = 0;
		var bx = 0;
		var by = 0;
		var wx = 0;
		var wy = 0;
	
		if (document.documentElement) {
			dx = document.documentElement.scrollLeft || 0;
			dy = document.documentElement.scrollTop || 0;
		}
		if (document.body) {
			bx = document.body.scrollLeft || 0;
			by = document.body.scrollTop || 0;
		}
		var wx = window.scrollX || 0;
		var wy = window.scrollY || 0;
	
		var x = Math.max(wx, Math.max(bx, dx));
		var y = Math.max(wy, Math.max(by, dy));
	
		var speed = 1 + acceleration;
		window.scrollTo(Math.floor(x / speed), Math.floor(y / speed));
		if(x > 0 || y > 0) {
			var invokeFunction = "MGJS.goTop(" + acceleration + ", " + time + ")"
			window.setTimeout(invokeFunction, time);
		}
	}
}