Html 效果之 A 标签.

<style type="text/css">

DIV#qTip {
 BORDER-RIGHT: #fff 1px solid; PADDING-RIGHT: 20px; BORDER-TOP: #fff 1px solid; DISPLAY: none; PADDING-LEFT: 20px; FONT-SIZE: 12px; Z-INDEX: 1000; BACKGROUND: #1ea3de; PADDING-BOTTOM: 10px; BORDER-LEFT: #fff 1px solid; COLOR: #fff; LINE-HEIGHT: 170%; PADDING-TOP: 10px; BORDER-BOTTOM: #fff 1px solid; FONT-FAMILY: Verdana, Arial, Helvetica, sans-serif; POSITION: absolute; TEXT-ALIGN: left
}
</style>
<a title="helloworld" href="#">hello world</a>
<SCRIPT language=JavaScript type=text/JavaScript>
 var qTipTag = "a";
 var qTipX = -30;
 var qTipY = 25;
tooltip = {
 name : "qTip",
  offsetX : qTipX,
  offsetY : qTipY,
tip : null
}
tooltip.init = function () {
 var tipNameSpaceURI = "http://www.w3.org/1999/xhtml";
if(!tipContainerID){ var tipContainerID = "qTip";}
var tipContainer = document.getElementById(tipContainerID);
 if(!tipContainer) {
  tipContainer = document.createElementNS ? document.createElementNS(tipNameSpaceURI, "div") : document.createElement("div");
  tipContainer.setAttribute("id", tipContainerID);
  document.getElementsByTagName("body").item(0).appendChild(tipContainer);
 }
if (!document.getElementById) return;
this.tip = document.getElementById (this.name);
 if (this.tip) document.onmousemove = function (evt) {tooltip.move (evt)};
var a, sTitle;
 var anchors = document.getElementsByTagName (qTipTag);
 for (var i = 0; i < anchors.length; i ++) {
  a = anchors[i];
 sTitle = a.getAttribute("title");
if(sTitle) {
  a.setAttribute("tiptitle", sTitle);
 a.removeAttribute("title");
 a.onmouseover = function() {tooltip.show(this.getAttribute('tiptitle'))};
 a.onmouseout = function() {tooltip.hide()};
 }
 }
 }
tooltip.move = function (evt) {
 var x=0, y=0;
 if (document.all) {//IE
 x = (document.documentElement && document.documentElement.scrollLeft) ? document.documentElement.scrollLeft : document.body.scrollLeft;
 y = (document.documentElement && document.documentElement.scrollTop) ? document.documentElement.scrollTop : document.body.scrollTop;
 x += window.event.clientX;
 y += window.event.clientY;
 } else {//Good Browsers
   x = evt.pageX;
   y = evt.pageY;
 }
 this.tip.style.left = (x + this.offsetX) + "px";
 this.tip.style.top = (y + this.offsetY) + "px";
 }
 tooltip.show = function (text) {
   if (!this.tip) return;
  this.tip.innerHTML = text;
  this.tip.style.display = "block";
}
tooltip.hide = function () {
  if (!this.tip) return;
  this.tip.innerHTML = "";
 this.tip.style.display = "none";
 }
 window.onload = function () {
  tooltip.init ();
 }
 </SCRIPT>