jQuery制作鼠标经过显示图片大图，生成图片tips效果

<script type="text/javascript"> // Load this script once the document is ready
$(document).ready(function () { // Get all the thumbnail
$('div.thumbnail-item').mouseenter(function(e) { // Calculate the position of the image tooltip
x = e.pageX - $(this).offset().left;
y = e.pageY - $(this).offset().top; // Set the z-index of the current item,
// make sure it's greater than the rest of thumbnail items
// Set the position and display the image tooltip
$(this).css('z-index','15')
.children("div.tooltip")
.css({'top': y + 10,'left': x + 20,'display':'block'}); }).mousemove(function(e) { // Calculate the position of the image tooltip
x = e.pageX - $(this).offset().left;
y = e.pageY - $(this).offset().top; // This line causes the tooltip will follow the mouse pointer
$(this).children("div.tooltip").css({'top': y + 10,'left': x + 20}); }).mouseleave(function() { // Reset the z-index and hide the image tooltip
$(this).css('z-index','1')
.children("div.tooltip")
.animate({"opacity": "hide"}, "fast");
}); }); </script>

<style> .thumbnail-item {
/* position relative so that we can use position absolute for the tooltip */
position: relative;
float: left;
margin: 0px 5px;
} .thumbnail-item a {
display: block;
} .thumbnail-item img.thumbnail {
border:3px solid #ccc;
} .tooltip {
/* by default, hide it */
display: none;
/* allow us to move the tooltip */
position: absolute;
/* align the image properly */
padding: 8px 0 0 8px;
} .tooltip span.overlay {
/* the png image, need ie6 hack though */
background: url(images/overlay.png) no-repeat;
/* put this overlay on the top of the tooltip image */
position: absolute;
top: 0px;
left: 0px;
display: block;
width: 350px;
height: 200px;
}
</style>

<div class="thumbnail-item">
<a href="#"><img src="data:images/small1.jpg" class="thumbnail"/></a>
<div class="tooltip">
<img src="data:images/big1.jpg" alt="" width="330" height="185" />
<span class="overlay"></span>
</div>
</div> <div class="thumbnail-item">
<a href="#"><img src="data:images/small2.jpg" class="thumbnail"/></a>
<div class="tooltip">
<img src="data:images/big2.jpg" alt="" width="330" height="185" />
<span class="overlay"></span>
</div>
</div> <div class="thumbnail-item">
<a href="#"><img src="data:images/small3.jpg" class="thumbnail"/></a>
<div class="tooltip">
<img src="data:images/big3.jpg" alt="" width="330" height="185" />
<span class="overlay"></span>
</div>
</div>