jQuery(document).ready( function() {
    jQuery(".thumbnail img").click( function() {
        var changeSrc = this.src;
        jQuery("#target").attr("src", changeSrc);
    });
    jQuery(".thumbnail2 img").click( function() {
        var changeSrc = this.src;
        jQuery("#target2").fadeOut(
            "slow",
            function() {
                jQuery(this).attr("src", changeSrc);
                jQuery(this).fadeIn();
            }
        );
    });

    jQuery(".thumbnail3 img").click( function() {
        var changeSrc = this.src;
        jQuery("#target3").slideUp(
            "slow",
            function() {
                jQuery(this).attr("src", changeSrc);
                jQuery(this).slideDown();
            }
        );
    });
});