当鼠标移到产品缩略图上时能弹出显示大图，用JS写两个函数即可实现：
一个函数在鼠标移到图片上调用，显示隐藏层并将图片载入到层中;
另一个函数在鼠标移出图片上调用，清空层的内容并隐藏层。使用时需将"this.src"改为产品大图地址。
以下是引用片段：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JS函数实现鼠标指向后带图片的提示效果</title>
<script language="javascript">
function showPic(sUrl){
var x,y;
x = event.clientX;
y = event.clientY;
document.getElementById("Layer1").style.left = x;
document.getElementById("Layer1").style.top = y;
document.getElementById("Layer1").innerHTML = "<img src=\"" + sUrl + "\">";
document.getElementById("Layer1").style.display = "block";
}
function hiddenPic(){
document.getElementById("Layer1").innerHTML = "";
document.getElementById("Layer1").style.display = "none";
}
</script>
</head>
<body>
<div id="Layer1" style="display:none;position:absolute;z-index:1;"></div>
<img src="/images/logo.gif" onmouseout="hiddenPic();" onmousemove="showPic(this.src);" />
<p></p>
<img src="/img/200406301.jpg" onmouseout="hiddenPic();" onmousemove="showPic(this.src);" />
</body>
</html>