// JavaScript Document

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}





var backToTop = {
	conf : {
		topFlag : "#pagetop" //"ページの先頭へ戻る"のhrefの値
	},
	
	main : function () {
		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 / 1.3), Math.floor(y / 1.3));
	
		if (x > 0 || y > 0) {
			window.setTimeout("backToTop.main()", 25);
		}
		else if (navigator.userAgent.indexOf("AppleWebKit") == -1){
			location.href = backToTop.conf.topFlag;
		}	
	},
	
	set : function () {
		var a = document.links;
		for(i=0;i<a .length;i++){
			
			if(new RegExp(backToTop.conf.topFlag + "\\b").exec(a[i].href)) {
				a[i].onclick = function(){
					this.removeAttribute("href")
					backToTop.main();
					this.setAttribute("href",backToTop.conf.topFlag);
					return false;
				}
			}
		}
	},
	
	addEvent : function(){
		try {
			window.addEventListener('load', backToTop.set, false);
		} catch (e) {
			window.attachEvent('onload', backToTop.set);
		}
	}
}

backToTop.addEvent();