CSS＋js实现的一个优秀的超链接鼠标悬停提示

　　超链接，一般的做法是给一个title属性，这样用户的鼠标悬停在超链接上的时候，它会显示title的内容。但是，你是否厌倦了千篇一律的鼠标悬停效果呢？
　　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。
　　实际的效果大家可以参考：校园招聘一网打尽（http://www.xyzp.net/）、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!
*************************************************************************/

var Tooltip = {
followMouse: true,
offX: 8,
offY: 12,
tipID: "tipDiv",
showDelay: 100,
hideDelay: 200,

ready:false, timer:null, tip:null,

init: function() {
if ( document.createElement && document.body && typeof
document.body.appendChild != "undefined" ) {
if ( !document.getElementById(this.tipID) ) {
var el = document.createElement("DIV");
el.id = this.tipID; document.body.appendChild(el);
}
this.ready = true;
}
},

show: function(e, msg) {
if (this.timer) { clearTimeout(this.timer); this.timer = 0; }
this.tip = document.getElementById( this.tipID );

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