<?php 
// Get gallery images from specific page so they could be used in a slideshow via JS and data-attribute
$pattern = get_shortcode_regex();
$imgurlstring = '';
$imgtitlestring = '';
$c = '';
$page_id = 228; 
$page_data = get_page( $page_id ); 
if( preg_match_all( '/'. $pattern .'/s', $page_data->post_content, $matches )
	&& array_key_exists( 2, $matches )
	&& in_array( 'gallery', $matches[2] ) ):
		$keys = array_keys( $matches[2], 'gallery' );
		foreach( $keys as $key ):
			$atts = shortcode_parse_atts( $matches[3][$key] );
				if( array_key_exists( 'ids', $atts ) ) {
					$imgarr = explode( ',', $atts['ids'] );
					$n = 0;
					foreach( $imgarr as $imgid ):
						if ($n > 0) {$c = ';';}
						$imgsrc = wp_get_attachment_image_src($imgid, 'cover_slideshow');
						$imgmeta = wp_get_attachment($imgid);
						$imgtitlestring .= $c.htmlspecialchars($imgmeta['caption']);
						$imgurlstring .= $c.urlencode($imgsrc[0]);
						$n = $n + 1;
					endforeach;
					$imgurlstring = ' data-imgids="'.$imgurlstring.'"';
					$imgtitlestring = ' data-imgtitles="'.$imgtitlestring.'"';
				}
		endforeach;
endif; ?>



<div class="content cover-section wide"<?php echo $imgurlstring.' '.$imgtitlestring; ?>>

//Javascript, used with Backstretch JQ plugin http://srobbin.com/jquery-plugins/backstretch/
	//Slideshow on home page
	if ($('.cover-section').length) {
		var $cover = $('.cover-section');
		var imgs = unescape($cover.data('imgids'));
		var titles = $cover.data('imgtitles');
		var title = '';
		var exploded = imgs.split(';');
		var explodedtitles = titles.split(';');
		$('.cover-section').backstretch(exploded, {duration: 4000, fade: 750});
		if (exploded.length > 1) {
			$cover.append('<ul class="pagination" />');
			$pagn = $cover.find('.pagination');
			$.each(exploded, function(i, val) {
				if (explodedtitles[i]) {title = ' title="'+explodedtitles[i]+'"';} else {title = '';}
				$pagn.append('<li><a href="javascript:;"'+title+'></a></li>');
				$pagn.find('a:eq('+i+')').on('click', function() {
					$('.cover-section').backstretch("show",i);
				});
			});
		}
		$pagn.find('a').first().addClass('current');
		$(window).on("backstretch.before", function (e, instance, index) {
			$pagn.find('a').removeClass('current');
			$pagn.find('li:eq('+index+') a').addClass('current');
		});
	}