原生的javascript实例：
代码精湛，可以观看
document.write("<div class='QQbox' id='divQQbox' >");
document.write("<div class='Qlist' id='divOnline' onmouseout='hideMsgBox(event);' style='display : none;'>");
document.write("<div class='t'></div>");
document.write("<div class='infobox'>我们营业的时间<br>9:00-18:00</div>");
document.write("<div class='con'>");
document.write("<ul>");
document.write("<li class=odd><a href='http://wpa.qq.com/msgrd?V=1&Uin=123456&Site=QQ咨询&Menu=yes' target='_blank'><img src=' http://wpa.qq.com/pa?p=1:123456:4' border='0' alt='QQ' />QQ咨询</a></li>");
document.write('<li><img src="themes/ecmoban_jiuxian/qq/images/msn.gif" width="18" height="17" border="0" alt="MSN" /> <a href="msnim:chat?contact=MSN帐号">MSN咨询</a></li>');
document.write('<li><a href="http://amos1.taobao.com/msg.ww?v=2&uid=旺旺号码&s=2" target="_blank"><img src="http://amos1.taobao.com/online.ww?v=2&uid=旺旺号码&s=2" width="16" height="16" border="0" alt="淘宝旺旺" />在线旺旺</a></li>');
document.write('<tr><td><li>咨询电话：010-88888888</li></td></tr>');
document.write("</ul>");
document.write("</div>");
document.write("<div class='b'></div>");
document.write("</div>");
document.write("<div id='divMenu' onmouseover='OnlineOver();'><img src='themes/ecmoban_jiuxian/qq/images/qq_1.gif' class='press' alt='在线咨询'></div>");
document.write("</div>");
//<![CDATA[
var tips; var theTop = 145
/*这是默认高度,越大越往下*/; var old = theTop;
function initFloatTips() {
tips = document.getElementById('divQQbox');
moveTips();
};
function moveTips() {
var tt=50;
if (window.innerHeight) {
pos = window.pageYOffset
}
else if (document.documentElement && document.documentElement.scrollTop) {
pos = document.documentElement.scrollTop
}
else if (document.body) {
pos = document.body.scrollTop;
}
pos=pos-tips.offsetTop+theTop;
pos=tips.offsetTop+pos/10;
if (pos < theTop) pos = theTop;
if (pos != old) {
tips.style.top = pos+"px";
tt=10;
//alert(tips.style.top);
}
old = pos;
setTimeout(moveTips,tt);
}
//!]]>
initFloatTips();
function OnlineOver(){
document.getElementById("divMenu").style.display = "none";
document.getElementById("divOnline").style.display = "block";
document.getElementById("divQQbox").style.width = "170px";
}
function OnlineOut(){
document.getElementById("divMenu").style.display = "block";
document.getElementById("divOnline").style.display = "none";
}
if(typeof(HTMLElement)!="undefined") //给firefox定义contains()方法，ie下不起作用
{
HTMLElement.prototype.contains=function(obj)
{
while(obj!=null&&typeof(obj.tagName)!="undefind"){ //通过循环对比来判断是不是obj的父元素
if(obj==this) return true;
obj=obj.parentNode;
}
return false;
};
}
function hideMsgBox(theEvent){ //theEvent用来传入事件，Firefox的方式
if (theEvent){
var browser=navigator.userAgent; //取得浏览器属性
if (browser.indexOf("Firefox")>0){ //如果是Firefox
if (document.getElementById('divOnline').contains(theEvent.relatedTarget)) { //如果是子元素
return; //结束函式
}
}
if (browser.indexOf("MSIE")>0){ //如果是IE
if (document.getElementById('divOnline').contains(event.toElement)) { //如果是子元素
return; //结束函式
}
}
}
/*要执行的操作*/
document.getElementById("divMenu").style.display = "block";
document.getElementById("divOnline").style.display = "none";
}