$(function() {
	var totalPanels			= $(".scrollContainer").children().size();	
	var regWidth			= $(".panel").css("width");
	var regImgWidth			= $(".panel img").css("width");
	var regTitleSize		= $(".panel h2").css("font-size");
	var regParSize			= $(".panel p").css("font-size");
	var movingDistance	    = 240;
	var curWidth			= 225;
	var curImgWidth			= 200;
	var curTitleSize		= "20px";
	var curParSize			= "15px";
	var $panels				= $('#slider .scrollContainer > div');
	var $container			= $('#slider .scrollContainer');
	$panels.css({'float' : 'left','position' : 'relative'});
	$("#slider").data("currentlyMoving", false);
	$container
		.css('width', ($panels[0].offsetWidth * $panels.length) + 100 )
		.css('left', "-1690px");
	var scroll = $('#slider .scroll').css('overflow', 'hidden');
	function returnToNormal(element) {
		$(element)
			.animate({ width: regWidth })
			.find("img")
			.animate({ width: regImgWidth })
		    .end()
			.find("h2")
			.animate({ fontSize: regTitleSize })
			.end()
	};
	function growBigger(element) {
		$(element)
			.animate({ width: curWidth })
			.find("img")
			.animate({ width: curImgWidth })
		    .end()
			.find("h2")
			.animate({ fontSize: curTitleSize })
			.end()	
	}
	
function anr()
{document.getElementById('pfeilright').style.visibility = 'visible';}

function ausr()
{document.getElementById('pfeilright').style.visibility = 'hidden';}

function an()
{document.getElementById('pfeilleft').style.visibility = 'visible';}

function aus()
{document.getElementById('pfeilleft').style.visibility = 'hidden';}
  	
	//direction true = right, false = left
	function change(direction) {
	var next         = direction ? curPanel + 1 : curPanel - 1;
	if((next == "15")){return false;}
	if((curPanel == "13")){ausr();}
	if((next < "14")){anr();}
	if(curPanel == "0"){return true;}
	if((curPanel <= "1")){aus();}
	if((next > "0")){an();}
	    //if not at the first or last panel
		if((direction && !(curPanel < totalPanels)) || (!direction && (curPanel <= 1))) { return false; }	
        //if not currently moving
        if (($("#slider").data("currentlyMoving") == false)) { 
			$("#slider").data("currentlyMoving", 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() {
					$("#slider").data("currentlyMoving", false);
				});
			returnToNormal("#panel_"+curPanel);
			growBigger("#panel_"+next);
			curPanel = next;
			//remove all previous bound functions
			$("#panel_"+(curPanel+1)).unbind();	
			//go forward
			$("#panel_"+(curPanel+1)).click(function(){ change(true); });
            //remove all previous bound functions															
			$("#panel_"+(curPanel-1)).unbind();
			//go back
			$("#panel_"+(curPanel-1)).click(function(){ change(false); }); 
			//remove all previous bound functions
			$("#panel_"+curPanel).unbind();
		}
	}
	// Set up "Current" panel and next and prev
	growBigger("#panel_8");	
	var curPanel = 8;
	$("#panel_"+(curPanel+1)).click(function(){ change(true); });
	$("#panel_"+(curPanel-1)).click(function(){ change(false); });
	//when the left/right arrows are clicked
	$(".right").click(function(){ change(true);});	
	$(".left").click(function(){ change(false); });
	$(window).keydown(function(event){
	  switch (event.keyCode) {
			case 13: //enter
				$(".right").click();
				break;
			case 32: //space
				$(".right").click();
				break;
	    case 37: //left arrow
				$(".left").click();
				break;
			case 39: //right arrow
				$(".right").click();
				break;
	  }
	});
});