jquery图片横向滚动焦点图

<div class="main_view">
<div class="window">
<div class="image_reel" style="width: 3160px; left: 0px;"><a href="http://www.16sucai.com/"><img src="http://www.cnblogs.com/chris-oil/admin/images/reel_1.jpg" alt="" /></a> <a href="http://www.16sucai.com/"><img src="http://www.cnblogs.com/chris-oil/admin/images/reel_2.jpg" alt="" /></a> <a href="http://www.16sucai.com/"><img src="http://www.cnblogs.com/chris-oil/admin/images/reel_3.jpg" alt="" /></a> <a href="http://www.16sucai.com/"><img src="http://www.cnblogs.com/chris-oil/admin/images/reel_4.jpg" alt="" /></a></div>
</div>
<div class="paging" style="display: block;"><a class="active" href="http://www.16sucai.com/" rel="1">1</a> <a href="http://www.16sucai.com/" rel="2">2</a> <a href="http://www.16sucai.com/" rel="3">3</a> <a href="http://www.16sucai.com/" rel="4">4</a></div>
</div>
<p>
<script type="text/javascript">// <![CDATA[
$(document).ready(function() {

    //Set Default State of each portfolio piece
    $(".paging").show();
    $(".paging a:first").addClass("active");
        
    //Get size of images, how many there are, then determin the size of the image reel.
    var imageWidth = $(".window").width();
    var imageSum = $(".image_reel img").size();
    var imageReelWidth = imageWidth * imageSum;
    
    //Adjust the image reel to its new size
    $(".image_reel").css({'width' : imageReelWidth});
    
    //Paging + Slider Function
    rotate = function(){    
        var triggerID = $active.attr("rel") - 1; //Get number of times to slide
        var image_reelPosition = triggerID * imageWidth; //Determines the distance the image reel needs to slide

        $(".paging a").removeClass('active'); //Remove all active class
        $active.addClass('active'); //Add active class (the $active is declared in the rotateSwitch function)
        
        //Slider Animation
        $(".image_reel").animate({ 
            left: -image_reelPosition
        }, 500 );
        
    }; 
    
    //Rotation + Timing Event
    rotateSwitch = function(){        
        play = setInterval(function(){ //Set timer - this will repeat itself every 3 seconds
            $active = $('.paging a.active').next();
            if ( $active.length === 0) { //If paging reaches the end...
                $active = $('.paging a:first'); //go back to first
            }
            rotate(); //Trigger the paging and slider function
        }, 7000); //Timer speed http://www.16sucai.com
    };
    
    rotateSwitch(); //Run function on launch
    
    //On Hover
    $(".image_reel a").hover(function() {
        clearInterval(play); //Stop the rotation
    }, function() {
        rotateSwitch(); //Resume rotation
    });    
    
    //On Click
    $(".paging a").click(function() {    
        $active = $(this); //Activate the clicked paging
        //Reset Timer
        clearInterval(play); //Stop the rotation
        rotate(); //Trigger rotation immediately
        rotateSwitch(); // Resume rotation
        return false; //Prevent browser jump to link anchor
    });    
    
});
// ]]></script>
</p>