/*

Author: mg12

Update: 2008/08/13

Author URI: http://www.neoease.com/

*/

(function() {

function setStyleDisplay(id, status) {

	document.getElementById(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);

	}

}

window['MGJS'] = {};

window['MGJS']['setStyleDisplay'] = setStyleDisplay;

window['MGJS']['goTop'] = goTop;

})();