div漂浮

function scrollx(p) {
        var d = document,
 dd = d.documentElement,  db = d.body,  w = window,  o = d.getElementById(p.id),  ie6 = /msie 6/i.test(navigator.userAgent),  style,  timer;  if (o) {  o.style.cssText += ";position:" + (p.f && !ie6 ? 'fixed': 'absolute') + ";" + (p.l == undefined ? 'right:0px;': 'left:' + p.l + 'px;') + (p.t != undefined ? 'top:' + p.t + 'px': 'bottom:0');  if (p.f && ie6) {  o.style.cssText += ';left:expression(documentElement.scrollLeft + ' + (p.l == undefined ? dd.clientWidth - o.offsetWidth: p.l) + ' + "px");top:expression(documentElement.scrollTop +' + (p.t == undefined ? dd.clientHeight - o.offsetHeight: p.t) + '+ "px" );';  dd.style.cssText += ';background-image: url(about:blank);background-attachment:fixed;';  } else {  if (!p.f) {  w.onresize = w.onscroll = function() {  clearInterval(timer);  timer = setInterval(function() {  var st = (dd.scrollTop || db.scrollTop),  c;  c = st - o.offsetTop + 300;  if (c != 0) {  o.style.top = o.offsetTop + Math.ceil(Math.abs(c) / 10) * (c < 0 ? -1 : 1) + 'px';  } else {  clearInterval(timer);  }  },  10)  }  }  }  }  }  scrollx({  id: 'Scollbox'  })