Displaying larger image, Jquery help please!

Displaying larger image, Jquery help please!

http://militarypewter.com/?page_id=308    <--- URL of my project

Image on right is my battle. when click a thumbnail it shows into the 'displayImg'
What I need is when click displayImg -> go to HREF of image that is currently displayed.

Sounds like it'd be easy but its not im a Jquery noob. PLEASE HELP! It will be greatly appreciated!

heres the code:

Script :
$(document).ready(function(){

//Larger thumbnail preview

$("ul.thumb li").hover(function() {
    $(this).css({'z-index' : '10'});
    $(this).find('img').addClass("hover").stop()
        .animate({
            marginTop: '-60px',
            marginLeft: '-60px',
            top: '50%',
            left: '50%',
            width: '75px',
            height: '75px',
            padding: '20px'
        }, 200);
   
    } , function() {
    $(this).css({'z-index' : '0'});
    $(this).find('img').removeClass("hover").stop()
        .animate({
            marginTop: '0',
            marginLeft: '0',
            top: '0',
            left: '0',
            width: '50px',
            height: '50px',
            padding: '5px'
        }, 400);
});

//Swap Image on Click
    $("ul.thumb li a").click(function() {
       
        var mainImage = $(this).attr("href"); //Find Image Name
        $("#main_view img").attr({ src: mainImage });
       
        return false;       
    });
 
});

HTML:
<div id="main_view" class="gradient-container">


    <a href="images/products/<?php echo $displayImg ?> "><img height="200px" src="images/products/<?php echo $displayImg ?>.jpg" alt="" /></a>

    </div>