why we dont use quotation mark for "href" attribute? I put the question mark next to the live I am having problem?

//Problem: User when clicking on image it goes to dead end //Solution: create and overlay with the larger image - Lightbox

var $overlay = $('<div id="overlay"></div>'); var $image = $("<img>");

// An image to overlay $overlay.append($image);

// Add overlay $("body").append($overlay);

// A caption

//1. Capture the click event on a link to an image $("#imageGallery a").click(function(){ event.preventDefault(); var href = $(this).attr("href"); // Update overlay with the image linked in the link

$image.attr("src", href); // ???????????????????????????????????????????????????????? // Show the overlay $overlay.show();

// Get child's alt attribute and set caption

});

// When overlay is clicked $overlay.click(function(){ // Hide the overlay $(this).hide(); });