// JavaScript Document
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); 
}  
function getComment(){
	var comment = document.getElementById('comment_scroll_title');
	if(comment){
		scroller(comment,500);
	}
}