var is_ie6 = false;
if (navigator.appName.indexOf("Explorer") >= 0) {
	appVer = navigator.userAgent;
	s = appVer.indexOf("MSIE ",0) + 5;
	e = appVer.indexOf(";",s);
	version = eval(appVer.substring(s,e));
	if (version == 6) {
		is_ie6 = true;
	}
}

if (is_ie6) {
	window.onload = function () {
		/*document.getElementById("gnav_child1").getElementsByTagName("UL")[0].style.display = "block";
		document.getElementById("gnav_child2").getElementsByTagName("UL")[0].style.display = "block";
		document.getElementById("gnav_child3").getElementsByTagName("UL")[0].style.display = "block";*/

		for (var i = 1; i <= 3; i++) {
			var element = document.getElementById("gnav_child"+i);
			element.onmouseover = function () {
				clearTimeout(this.timer_id);
				side_navi_open(this.getElementsByTagName("UL")[0]);
			};
			element.onmouseout = function () {
				this.timer_id = setTimeout("side_navi_close_ie6('"+this.id+"')", 200);
			};
			element.getElementsByTagName("UL")[0].onmouseover = function () {
				clearTimeout(this.timer_id);
				side_navi_open(this);
			};
		}
	}
}
if (!is_ie6) {
	window.onload = function () {
		for (var i = 1; i <= 3; i++) {
			var element = document.getElementById("gnav_child"+i);
			element.onmouseover = function () {
				side_navi_open(this.getElementsByTagName("UL")[0]);
			};
			element.onmouseout = function () {
				side_navi_close(this.getElementsByTagName("UL")[0]);
			};
			element.getElementsByTagName("UL")[0].onmouseover = function () {
				side_navi_open(this);
			};
		}
	}
}

function side_navi_open(navi) {
	side_navi_change(navi, true);
}

function side_navi_close(navi) {
	side_navi_change(navi, false);
}

function side_navi_change(navi, is_open) {
	if (is_open) {
		navi.style.display = "block";
	} else {
		navi.style.display = "none";
	}
}

function side_navi_close_ie6(id) {
	var element = document.getElementById(id);
	var ele = element.getElementsByTagName("UL")[0];
	side_navi_close(ele);
}

function backToTop() {
  var x1 = x2 = x3 = 0;
  var y1 = y2 = y3 = 0;
  if (document.documentElement) {
      x1 = document.documentElement.scrollLeft || 0;
      y1 = document.documentElement.scrollTop || 0;
  }
  if (document.body) {
      x2 = document.body.scrollLeft || 0;
      y2 = document.body.scrollTop || 0;
  }
  x3 = window.scrollX || 0;
  y3 = window.scrollY || 0;
  var x = Math.max(x1, Math.max(x2, x3));
  var y = Math.max(y1, Math.max(y2, y3));
  window.scrollTo(Math.floor(x / 2), Math.floor(y / 2));
  if (x > 0 || y > 0) {
      window.setTimeout("backToTop()", 25);
  }
}