这个论坛鼠标放在头像上旁边就显示一个信息框，怎么实现的
这个论坛鼠标放在头像上旁边就显示一个信息框，怎么实现的？

------解决方案--------------------
<img onmouseover="try{showUserCard(this,'zxwangqiang')}catch(ex){};" src="http://avatar.profile.csdn.net/A/0/3/2_zxwangqiang.jpg">
------解决方案--------------------
换图做个测试：参考：

<div align=center style="overfow: hidden; width: 100px; height: 100px">
<img src="3.jpg" width="100" height="100" border="0" onmouseover="show(this)" onmouseout="hide(this)"> 
</div> 
<div align=center style="overfow: hidden; width: 100px; height: 100px"> 
<img src="1.jpg" width="100" height="100" border="0" onmouseover="show(this)" onmouseout="hide(this)"> 
</div> 
<div align=center style="overfow: hidden; width: 100px; height: 100px"> 
<img src="2.jpg" width="100" height="100" border="0" onmouseover="show(this)" onmouseout="hide(this)"> 
</div> 
<div id="enlarge_images" style="position: absolute; z-index:2"></div> 

<SCRIPT>
function show(_this) { 
document.getElementById("enlarge_images").innerHTML = "<img src='" + _this.src + "' >"; 
} 
function hide(_this) { 
document.getElementById("enlarge_images").innerHTML = ""; 
} 
function move_layer(event){ 
event = event || window.event; 
enlarge_images.style.left=event.clientX+document.body.scrollLeft+10; 
enlarge_images.style.top=event.clientY+document.body.scrollTop+10; 
} 
document.onmousemove =move_layer; 
</SCRIPT>