var url = location.href.toLowerCase();
var AV  = navigator.appVersion.toLowerCase();
var UA  = navigator.userAgent.toLowerCase();
var win = ( AV.indexOf("windows") != -1) ? true : false;
var wie = ( AV.indexOf("windows") != -1 && UA.indexOf("msie") != -1) ? true : false;
var mac = ( AV.indexOf("macintosh") != -1) ? true : false;
var mie = ( AV.indexOf("macintosh") != -1 && UA.indexOf("msie") != -1) ? true : false;

if(wie){
var ieversion = AV.match(/msie (\d)/);
ieversion = RegExp.$1;
if(ieversion == 6){
	document.execCommand("BackgroundImageCache",false,true);
	}
}

if(mac){document.write('<link rel="stylesheet" type="text/css" href="/css/macfont.css">');}

window.onload = function(){
//document.getElementById('logo').innerHTML = cnt;
var UnderPosition = document.getElementById('bottom').offsetTop;
if(wie){ var BrowserHeight = document.documentElement.clientHeight;}
else if(mie){ var BrowserHeight = document.body.clientHeight;}
else{ var BrowserHeight = window.innerHeight;}
var PagetopOnOff = UnderPosition - BrowserHeight;
if ((PagetopOnOff > 0) && document.getElementById('pagetop')){
	document.getElementById('pagetop').style.visibility = 'visible';
	}
}