function $(id) {
return document.getElementById(id);
}

function scrollBanner(timer, moveNumber) {

function move(o) {
   var st = document.documentElement.scrollTop + o.t;
   var sl = document.documentElement.scrollLeft + (o.c == 0 ? o.a : document.documentElement.clientWidth - o.a - o.offsetWidth);
   var tc = st - o.offsetTop, lc = sl - o.offsetLeft;
   with (o.style) {
    top = o.offsetTop + (tc != 0 ? tc / Math.abs(tc) : 0) * Math.min(Math.abs(tc), moveNumber) + "px";
    left = o.offsetLeft + (lc != 0 ? lc / Math.abs(lc) : 0) * Math.min(Math.abs(lc), moveNumber) + "px";
   }
   if (o.person) {
    with (o.person.style) {
     top = o.offsetTop + "px";
     left = o.offsetLeft + o.offsetWidth - o.person.offsetWidth + "px";
    }
   }
}

var hidden = function() {
   var o = this.parent;
   window.clearInterval(o.interval);
   o.parentNode.removeChild(o);
   this.parentNode.removeChild(this);
}

this.add = function (to, t, a, c, lo) {
   /*
   to为object对象
   t为距离顶端距离
   当c = 0的时候，a为距离左边的距离
   当c != 0的时候，a为距离右边的距离
   lo为关闭按钮
   */
   var div, exec = function () {
    move(to);
   };
  
   to.person = lo;
   to.t = t;
   to.a = a;
   to.c = c;
   with (to.style) {
    position = "absolute";
    display = "block";
    top = document.documentElement.scrollTop + t;
    left = document.documentElement.scrollLeft + (c == 0 ? a : document.documentElement.clientWidth - a - to.offsetWidth);
   }
  
   if ("undefined" != typeof lo) {
    with (lo.style) {
     position = "absolute";
     display = "block";
    }   
    lo.onmousedown = hidden;
    lo.parent = to;
   }
   exec();
   to.interval = window.setInterval(exec, timer);
};
}