function intval(v) 
{ 
v = parseInt(v); 
    return isNaN(v) ? 0 : v; 
} 
// 获取元素信息 
function getPos(e) 
{ 
    var l = 0; 
    var t  = 0; 
    var w = intval(e.style.width); 
    var h = intval(e.style.height); 
    var wb = e.offsetWidth; 
    var hb = e.offsetHeight; 
    while (e.offsetParent){ 
l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0); 
t += e.offsetTop  + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0); 
e = e.offsetParent; 
    } 
l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0); 
t  += e.offsetTop  + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0); 
    return {x:l, y:t, w:w, h:h, wb:wb, hb:hb}; 
} 
// 获取滚动条信息 
function getScroll()  
{ 
    var t, l, w, h; 
     
    if (document.documentElement && document.documentElement.scrollTop) { 
t = document.documentElement.scrollTop; 
l = document.documentElement.scrollLeft; 
w = document.documentElement.scrollWidth; 
h = document.documentElement.scrollHeight; 
    } else if (document.body) { 
t = document.body.scrollTop; 
l = document.body.scrollLeft; 
w = document.body.scrollWidth; 
h = document.body.scrollHeight; 
    } 
    return { t: t, l: l, w: w, h: h }; 
} 
// 锚点(Anchor)间平滑跳转 
function scroller(el, duration) 
{ 
    if(typeof el != 'object') { el = document.getElementById(el); } 
    if(!el) return; 
    var z = this; 
z.el = el; 
z.p = getPos(el); 
z.s = getScroll(); 
z.clear = function(){window.clearInterval(z.timer);z.timer=null}; 
z.t=(new Date).getTime(); 
z.step = function(){ 
        var t = (new Date).getTime(); 
        var p = (t - z.t) / duration; 
        if (t >= duration + z.t) { 
z.clear(); 
window.setTimeout(function(){z.scroll(z.p.y, z.p.x)},13); 
        } else { 
st = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.y-z.s.t) + z.s.t; 
sl = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.x-z.s.l) + z.s.l; 
z.scroll(st, sl); 
        } 
    }; 
z.scroll = function (t, l){window.scrollTo(l, t)}; 
z.timer = window.setInterval(function(){z.step();},13); 
}