function $(i) {
	return document.getElementById(i);
}
window.onload = function (){
	var browser=navigator.appName
	if(browser != "Microsoft Internet Explorer") return;
	
	$("returnTop").style.display="none";
	$("returnDiv").style.right = (document.documentElement.clientWidth - 1160)/2 + "px";
	$("returnDiv").style.bottom = 20 + "px";
	
	window.onscroll = set;
	$("returnDiv").onclick = function() {
		$("returnDiv").style.display="none";
		window.onscroll=null;
		this.timer=setInterval(function(){
			document.documentElement.scrollTop-=Math.ceil(document.documentElement.scrollTop*0.1);
			if(document.documentElement.scrollTop==0) clearInterval($("returnDiv").timer,window.onscroll=set);	
		},5);
	};

	function set() {
		if(document.compatMode != 'undefined' && document.compatMode != 'BackCompat'){
			var vTop = parseInt(document.documentElement.clientHeight);
			var scrollTop = document.documentElement.scrollTop || window.pageYOffset;
			var clienHeight = document.documentElement.clientHeight;
		} else {
			var vTop = parseInt(document.body.clientHeight);
			var scrollTop = document.body.scrollTop || window.pageYOffset;
			var clienHeight = document.body.clientHeight;
		}
		if (scrollTop<100) {
			$("returnTop").style.display="none";
		} else {
			if (scrollTop>100) {
				$("returnTop").style.display="block";
				$("returnDiv").style.display="block";	
				if(parseInt((scrollTop-100)/2)<=100) {
					$('returnTop').filters.alpha.opacity = parseInt((scrollTop-100)/2);
				}
				else if(parseInt((scrollTop-100)/2)!=100) {
					$("returnTop").filters.alpha.opacity = 100;
				}
			}
		}
	}
}