function ks(){
       return true;
}
window.onerror=ks;
function nav(c, config){
       this.config = config || {speed: 10, num: 2};
       this.container = (typeof(c)=="object") ? c : document.getElementById(c);
       this.lineHeight = this.container.offsetHeight;
       this.scrollTimeId = null;
       var _this = this;       
       this.__construct = function (){
              var inner,el,href;
              inner = _this.container.childNodes[0].innerHTML;
              href = _this.container.childNodes[0].href;
              el = document.createElement("a");
              el.innerHTML = inner;
              el.href = href;
              el.className = 'hover';
              _this.container.appendChild(el);
              _this.container.onmouseover = function (){_this.start()};
              _this.container.onmouseout  = function (){_this.end()};
       }();
       this.start = function (){
              _this.clear();
              _this.scrollTimeId = setTimeout(function(){_this.scrollUp();}, _this.config.speed);
       };
       this.end = function (){
              _this.clear();
              _this.scrollTimeId = setTimeout(function(){_this.scrollDown();}, _this.config.speed);
       };
       this.scrollUp = function (){
              var c = _this.container;      
              if(c.scrollTop >= _this.lineHeight){c.scrollTop = _this.lineHeight;return;}
              c.scrollTop += _this.config.num;
              _this.scrollTimeId = setTimeout(function(){_this.scrollUp();}, _this.config.speed);
       };
       this.scrollDown = function (){
              var c = _this.container;
              
              if(c.scrollTop <= 0){c.scrollTop = 0;return;}
              c.scrollTop -= _this.config.num;
              _this.scrollTimeId = setTimeout(function(){_this.scrollDown();}, _this.config.speed);
       };
       this.clear = function (){clearTimeout(_this.scrollTimeId)};
}
(function(){
       var container = document.getElementById('nav');
       var el_li = container.getElementsByTagName('li');
       var arr = [];
       for( var i = 0; i < el_li.length; i++){
              if(el_li[i].className == 'on') continue;
              arr[i] = new nav(el_li[i], {speed: 10, num: 4});
       }
})
();