/**
 * Instantiate the ShadowboxFrontend Plus
 */ 

function wp_shadowbox_link_replace($string)
{
	$rel_attr = ' rel="shadowbox;width=1024;height=768"';
	$pattern = '/<a(.*?)href=(\'|")([^>]*)(\'|")(.*?)>/i';
	$replacement = '<a$1href=$2$3$4' . $rel_attr . '$5>';
	$rel_pattern = '/\ rel=(\'|")(.*?)(\'|")/i';
	$dwl_pattern = '/<a(.*?)href=(\'|")([^>]*)\.(zip|lzh|rar|7z|arc|bz2|gz|tgz|pea|balz|tar|exe|rpm|msi|[0-9]{3}|pdf|xls|doc|ppt|vsd|mpp)(\'|")(.*?)>/i';
	$swh_pattern = '/\ onclick=(\'|")(.*?)(\'|")/i';
	$tube_pattern = '/<a(.*?)href=(\'|")([^>]*)(youtube\.com\/(watch|v\/))(.*?)(\'|")(.*?)>/i';
	$tube_attr = '&autoplay=1';
	$tube_replacement = '<a$1href=$2$3$4$6' . $tube_attr . '$7$8>';
	$gogl_pattern = '/<a(.*?)href=(\'|")([^>]*)(video\.google\.([^\/]+)\/googleplayer.swf)(.*?)(\'|")(.*?)>/i';
	$gogl_attr = '&autoPlay=true';
	$gogl_replacement = '<a$1href=$2$3$4$6' . $gogl_attr . '$7$8>';

	if (preg_match_all($pattern,$string,$links)) {
		foreach ($links[0] as $link) {
			if (preg_match($tube_pattern,$link)) {
				$tube_link = preg_replace($tube_pattern,$tube_replacement,$link);
				$string = str_replace($link,$tube_link,$string);
			}
			elseif (preg_match($gogl_pattern,$link)) {
				$gogl_link = preg_replace($gogl_pattern,$gogl_replacement,$link);
				$string = str_replace($link,$gogl_link,$string);
			}
			if (!preg_match($rel_pattern,$link) && !preg_match($dwl_pattern,$link) && !preg_match($swh_pattern,$link)) {
				$link_replace = preg_replace($pattern,$replacement,$link);
				$string = str_replace($link,$link_replace,$string);
			}
		}
	}
	return $string;
}

add_filter('the_content', 'wp_shadowbox_link_replace',12);