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<style>.totop{position:fixed;right:25px;bottom:25px;display:block;width:26px;height:62px;background:url('/img/rocket.png') no-repeat 0 0;-webkit-transition: all 0.2s ease-in-out;} .totop:hover{background:url('/img/rocket.png') no-repeat 0 -62px;}</style> <script> function gotoTop(acceleration, stime) { acceleration = acceleration || 0.1; stime = stime || 10; var x1 = 0; var y1 = 0; var x2 = 0; var y2 = 0; var x3 = 0; var 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; } var x3 = window.scrollX || 0; var y3 = window.scrollY || 0; var x = Math.max(x1, Math.max(x2, x3)); var y = Math.max(y1, Math.max(y2, y3)); var speeding = 1 + acceleration; window.scrollTo(Math.floor(x / speeding), Math.floor(y / speeding)); if(x > 0 || y > 0) { var run = "gotoTop(" + acceleration + ", " + stime + ")"; window.setTimeout(run, stime); }} </script> <a href="javascript:;" onclick="gotoTop();return false;" class="totop">
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