$(function() {

  //remove js-disabled class
	$("#viewer").removeClass("js-disabled");

  //create new container for images
	$("<div>").attr("id", "container").css({ position:"absolute"}).width($(".gwrapper").length * 170).height(170).appendTo("div#viewer");
	
	//add images to container
	$(".gwrapper").each(function() {
		$(this).appendTo("div#container");
	});
	
	//work out duration of anim based on number of images (1 second for each image)
	var duration = $(".gwrapper").length * 1000;
	
	//store speed for later (distance / time)
	var speed = (parseInt($("div#container").width()) + parseInt($("div#viewer").width())) / duration;
					
	//set direction
	var direction = "rtl";
	
	//set initial position and class based on direction
	(direction == "rtl") ? $("div#container").css("left", $("div#viewer").width()).addClass("rtl") : $("div#container").css("left", 0 - $("div#container").width()).addClass("ltr") ;
	
	//animator function
	var animator = function(el, time, dir) {
	 
		//which direction to scroll
		if(dir == "rtl") {
		  
		  //add direction class
			el.removeClass("ltr").addClass("rtl");
				
			//animate the el
			el.animate({ left:"-" + el.width() + "px" }, time, "linear", function() {
									
				//reset container position
				$(this).css({ left:$("div#imageScroller").width(), right:"" });
				
				//restart animation
				animator($(this), duration, "rtl");
				
				//hide controls if visible
				($("div#controls").length > 0) ? $("div#controls").slideUp("slow").remove() : null ;			
								
			});
		} else {
		
		  //add direction class
			el.removeClass("rtl").addClass("ltr");
		
			//animate the el
			el.animate({ left:$("div#viewer").width() + "px" }, time, "linear", function() {
									
				//reset container position
				$(this).css({ left:0 - $("div#container").width() });
				
				//restart animation
				animator($(this), duration, "ltr");
				
				//hide controls if visible
				($("div#controls").length > 0) ? $("div#controls").slideUp("slow").remove() : null ;			
			});
		}
	}
	
	//start anim
	animator($("div#container"), duration, direction);
	
	//pause on mouseover
	$("a.gwrapper").live("mouseover", function() {
	  
		//stop anim
		$("div#container").stop(true);
		
		//show controls
		($("div#controls").length == 0) ? $("<div>").attr("id", "controls").appendTo("div#outerContainer").css({ opacity:0.7 }).slideDown("slow") : null ;
		($("a#rtl").length == 0) ? $("<a>").attr({ id:"rtl", href:"#", title:"rtl" }).appendTo("#controls") : null ;
		($("a#ltr").length == 0) ? $("<a>").attr({ id:"ltr", href:"#", title:"ltr" }).appendTo("#controls") : null ;
		
		//variable to hold trigger element
		var title = $(this).attr("title");
		
		//add p if doesn't exist, update it if it does
		($("p#title").length == 0) ? $("<p>").attr("id", "title").text(title).appendTo("div#controls") : $("p#title").text(title) ;
	});
	
	//restart on mouseout
	$("a.gwrapper").live("mouseout", function(e) {
	  
		//hide controls if not hovering on them
		(e.relatedTarget == null) ? null : (e.relatedTarget.id != "controls") ? $("div#controls").slideUp("slow").remove() : null ;
		
		//work out total travel distance
		var totalDistance = parseInt($("div#container").width()) + parseInt($("div#viewer").width());
											
		//work out distance left to travel
		var distanceLeft = ($("div#container").hasClass("ltr")) ? totalDistance - (parseInt($("div#container").css("left")) + parseInt($("div#container").width())) : totalDistance - (parseInt($("div#viewer").width()) - (parseInt($("div#container").css("left")))) ;
		
		//new duration is distance left / speed)
		var newDuration = distanceLeft / speed;
	
		//restart anim
		animator($("div#container"), newDuration, $("div#container").attr("class"));

	});
									
	//handler for ltr button
	$("#ltr").live("click", function() {
						
		//stop anim
		$("div#container").stop(true);
	
		//swap class names
		$("div#container").removeClass("rtl").addClass("ltr");
							
		//work out total travel distance
		var totalDistance = parseInt($("div#container").width()) + parseInt($("div#viewer").width());
		
		//work out remaining distance
		var distanceLeft = totalDistance - (parseInt($("div#container").css("left")) + parseInt($("div#container").width()));
		
		//new duration is distance left / speed)
		var newDuration = distanceLeft / speed;
		
		//restart anim
		animator($("div#container"), newDuration, "ltr");
	});
	
	//handler for rtl button
	$("#rtl").live("click", function() {
							
		//stop anim
		$("div#container").stop(true);
		
		//swap class names
		$("div#container").removeClass("ltr").addClass("rtl");
		
		//work out total travel distance
		var totalDistance = parseInt($("div#container").width()) + parseInt($("div#viewer").width());

		//work out remaining distance
		var distanceLeft = totalDistance - (parseInt($("div#viewer").width()) - (parseInt($("div#container").css("left"))));
		
		//new duration is distance left / speed)
		var newDuration = distanceLeft / speed;
	
		//restart anim
		animator($("div#container"), newDuration, "rtl");
	});
});