var y = 0;
var ny = 0;
var speed = 0;
var scrollSize =0.8;
function pageTop() {		
	var ts=0;
	if (document.layers) {
		ts=window.pageYOffset;
	} else if (document.body.scrollTop) {
		ts=document.body.scrollTop;
	} else {
		ts=document.documentElement.scrollTop;
	}
	if (ts>0) {
		var nv=(ts-5)*0.2;
		if (nv<1) { 
			nv=1;
		}
		scrollBy(0,-nv);
		setTimeout("pageTop()",20);
	}
}

addListener(window, 'load', function() {
	var pagetop = document.getElementById("link-pagetop");
	if(pagetop) {
		pagetop.onclick = pageTop;
		pagetop.style.cursor = "pointer";
	}
});