$(document).ready(function() {
	var moving 				= false;
	var totalPanels			= $(".panel").size()-2;
		
	var regWidth			= 169;
	var movingDistance	    = 169;
	var curWidth			= 113;

	var $panels				= $('.panel');
	var $container			= $('.scrollContainer');

	$panels.css({'float' : 'left','position' : 'relative'});
	$container
		.css('width', ((totalPanels+2)*400) + 100 );
	
	//direction true = right, false = left
	function change(direction) {
	    //if not at the first or last panel
		if((direction && !(curPanel < totalPanels)) || (!direction && (curPanel <= 1))) { return false; }	
        
        //if not currently moving
        if ((moving == false)) {
            
			moving = true;
			
			var next         = direction ? curPanel + 1 : curPanel - 1;
			var leftValue    = $(".scrollContainer").css("left");
			var movement	 = direction ? parseFloat(leftValue, 10) - movingDistance : parseFloat(leftValue, 10) + movingDistance;
			$(".scrollContainer")
				.stop()
				.animate({
					"left": movement
				}, function() {
					moving = false;
					
					if (curPanel!=totalPanels) {
						$('.previous').css('visibility','visible');
					}
					if (curPanel!=1) {
						$('.forward').css('visibility','visible');
					} 
					
				});
			
			
			curPanel = next;
			
		if (curPanel==1) {
			$('.forward').css('visibility','hidden');
		} 
		
		if (curPanel==totalPanels) {
			$('.previous').css('visibility','hidden');
		} 
			
		}
		
		
	}
	
	var curPanel = 1;
	
	//when the left/right arrows are clicked
	$(".forward").click(function(){ change(false); });	
	$(".previous").click(function(){ change(true); });
	
	$('.forward').css('visibility','hidden');	
	
	if ($(".panel").size()<4) {
		$('.previous').css('visibility','hidden');
	}

	
});