当然，也有这方面很炫的代码，但是才跨浏览器方面功夫还是不够，呵呵。我遇到一个不错的css，在IE和Firefox下浏览一样的效果。

      下图是实际运行的效果：

实际的效果大家可以参考：校园招聘一网打尽 http://www.xyzp.net/index.html

代码如下：

/*************************************************************************

  dw_viewport.js
  version date Nov 2003
 
  This code is from Dynamic Web Coding
  at http://www.dyn-web.com/
  Copyright 2003 by Sharon Paine
  See Terms of Use at http://www.dyn-web.com/bus/terms.html
  regarding conditions under which you may use this code.
  This notice must be retained in the code as is!

*************************************************************************/ 
 
var viewport = {
  getWinWidth: function () {
    this.width = 0;
    if (window.innerWidth) this.width = window.innerWidth - 18;
    else if (document.documentElement && document.documentElement.clientWidth)
    this.width = document.documentElement.clientWidth;
    else if (document.body && document.body.clientWidth)
    this.width = document.body.clientWidth;
  },
 
  getWinHeight: function () {
    this.height = 0;
    if (window.innerHeight) this.height = window.innerHeight - 18;
   else if (document.documentElement && document.documentElement.clientHeight)
    this.height = document.documentElement.clientHeight;
   else if (document.body && document.body.clientHeight)
    this.height = document.body.clientHeight;
  },
 
  getScrollX: function () {
    this.scrollX = 0;
   if (typeof window.pageXOffset == "number") this.scrollX = window.pageXOffset;
   else if (document.documentElement && document.documentElement.scrollLeft)
    this.scrollX = document.documentElement.scrollLeft;
   else if (document.body && document.body.scrollLeft)
    this.scrollX = document.body.scrollLeft;
   else if (window.scrollX) this.scrollX = window.scrollX;
  },
 
  getScrollY: function () {
    this.scrollY = 0;   
    if (typeof window.pageYOffset == "number") this.scrollY = window.pageYOffset;
    else if (document.documentElement && document.documentElement.scrollTop)
    this.scrollY = document.documentElement.scrollTop;
   else if (document.body && document.body.scrollTop)
    this.scrollY = document.body.scrollTop;
   else if (window.scrollY) this.scrollY = window.scrollY;
  },
 
  getAll: function () {
    this.getWinWidth(); this.getWinHeight();
    this.getScrollX();  this.getScrollY();
  }
 
}

/*************************************************************************
    dw_event.js (version date Feb 2004)
       
    This code is from Dynamic Web Coding at http://www.dyn-web.com/
    See Terms of Use at http://www.dyn-web.com/bus/terms.html
    regarding conditions under which you may use this code.
    This notice must be retained in the code as is!
*************************************************************************/

var dw_event = {
 
  add: function(obj, etype, fp, cap) {
    cap = cap || false;
    if (obj.addEventListener) obj.addEventListener(etype, fp, cap);
    else if (obj.attachEvent) obj.attachEvent("on" + etype, fp);
  },

  remove: function(obj, etype, fp, cap) {
    cap = cap || false;
    if (obj.removeEventListener) obj.removeEventListener(etype, fp, cap);
    else if (obj.detachEvent) obj.detachEvent("on" + etype, fp);
  },

  DOMit: function(e) {
    e = e? e: window.event;
    e.tgt = e.srcElement? e.srcElement: e.target;
   
    if (!e.preventDefault) e.preventDefault = function () { return false; }
    if (!e.stopPropagation) e.stopPropagation = function ()
{ if (window.event) window.event.cancelBubble = true; }
       
    return e;
  }
 
}
/*************************************************************************
  dw_tooltip.js   requires: dw_event.js and dw_viewport.js
  version date: March 14, 2005
  (minor changes in position algorithm and timer mechanism)
 
  This code is from Dynamic Web Coding at dyn-web.com
  Copyright 2003-5 by Sharon Paine
  See Terms of Use at www.dyn-web.com/bus/terms.html
  regarding conditions under which you may use this code.
  This notice must be retained in the code as is!
*************************************************************************/