//	スクロール
	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()", 20);
		}
	}