$(function() {

	function rnd(n){
		return Math.floor(Math.random()*(n+1));
	}

	function window_resize() {
		var window_height = window.innerHeight ? window.innerHeight: $(window).height();
		var window_width = $(window).width();
		var window_ratio = window_height / window_width;
		if( $("#container #index > div.slide")[0] ){
			$("#container #index > div.slide > div.img > img").each(function(){
				$(this).imagesLoaded(function(){
					$(this).addClass("loaded");
					var img_ratio = $(this).height() / $(this).width();

					$(this).parent().removeClass("horizontal vertical");
					if( window_ratio < img_ratio ){
						$(this).parent().addClass("vertical");
					}else{
						$(this).parent().addClass("horizontal");
					}
				});
			});
		}
	}

	function slide_start(target_wrapper) {
		window_resize();
		var max_num = target_wrapper.children("div.img").length;
		target_wrapper.children("div.img").eq(rnd(max_num-1)).addClass("active");
		if( typeof timerId_slide != "undefined" ){
			clearInterval(timerId_slide);
		}
		timerId_slide = setInterval(function(){
			if( max_num > 1 ){
				var past_target = target_wrapper.children("div.img.active");
				past_target.removeClass("active");
				var next_target = "";
				if( past_target.next("div.img")[0] ){
					next_target = past_target.next("div.img");
				}else{
					next_target = target_wrapper.children("div.img").first();
				}
				next_target.addClass("active");
			}else{
				clearInterval(timerId_slide);
			}
		},15000);
	}

	slide_start( $("#container #index > div.slide") );

});