(function($) {

	var frame;

	$( function() {

		// Fetch available headers and apply jQuery.masonry

		// once the images have loaded.

		var $headers = $('.available-headers');

		$headers.imagesLoaded( function() {

			$headers.masonry({

				itemSelector: '.default-header',

				isRTL: !! ( 'undefined' != typeof isRtl && isRtl )

			});

		});

		// Build the choose from library frame.

		$('#choose-from-library-link').click( function( event ) {

			var $el = $(this);

			event.preventDefault();

			// If the media frame already exists, reopen it.

			if ( frame ) {

				frame.open();

				return;

			}

			// Create the media frame.

			frame = wp.media.frames.customHeader = wp.media({

				// Set the title of the modal.

				title: $el.data('choose'),

				// Tell the modal to show only images.

				library: {

					type: 'image'

				},

				// Customize the submit button.

				button: {

					// Set the text of the button.

					text: $el.data('update'),

					// Tell the button not to close the modal, since we're

					// going to refresh the page when the image is selected.

					close: false

				}

			});

			// When an image is selected, run a callback.

			frame.on( 'select', function() {

				// Grab the selected attachment.

				var attachment = frame.state().get('selection').first(),

					link = $el.data('updateLink');

				// Tell the browser to navigate to the crop step.

				window.location = link + '&file=' + attachment.id;

			});

			frame.open();

		});

	});

}(jQuery));