// JavaScript Document
	 
	// 转换为数字 
	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); 
	}