$(document).ready(function(){
	/* This code is executed after the DOM has been completely loaded */
	
	var totWidth=0;
	var positions = new Array();
	
	$('.slides .slide').each(function(i){
		
		/* Traverse through all the slides and store their accumulative widths in totWidth */
		positions[i]= totWidth;
		totWidth += $(this).width();
		
		/* The positions array contains each slide's commulutative offset from the left part of the container */
		
		if(!$(this).width())
		{
			alert("Please, fill in width & height for all your images!");
			return false;
		}
	});
	
	/* Change the cotnainer div's width to the exact width of all the slides combined */
	$('.slides').width(totWidth);
	
	
	$('.menu ul li a').click(function(e,keepScroll,fromArrow){

		/* On a thumbnail click */
		if(!fromArrow){
			$('li.menuItem').removeClass('act').addClass('inact');
			$(this).parent().addClass('act');
		
			var pos = $(this).parent().prevAll('.menuItem').length;
			current = pos;
			/* Start the sliding animation */
			$('.slides').stop().animate({marginLeft:-positions[pos]+'px'},450);
		}
		else{
			$('li.menuItem').removeClass('act').addClass('inact');
			$(this).parent().addClass('act');
		
			var pos = current;
			/* Start the sliding animation */
			$('.slides').stop().animate({marginLeft:-positions[pos]+'px'},450);
		}
		
		//animate thumbnails
		
		/* Prevent the default action of the link */
		e.preventDefault();
		
		// Stopping the auto-advance if an icon has been clicked:
		if(!keepScroll) clearInterval(itvl);
	});
////////////////////////////////////////////////////////////////////	
	var current=0;
	$('.menu #arrow_left').click(function(e,keepScroll){
		(current == 0)? current = positions.length-1 : current--; //if statement using ternery operator
		//if(current==0){current = positions.length-1;}else{current--;}
		$('.menu ul li a').eq(current%$('.menu ul li a').length).trigger('click',[true, true]);
		clearInterval(itvl);
	});
	
	$('.menu #arrow_right').click(function(e,keepScroll){
		(current == positions.length-1)? current = 0: current++; //If statement using ternery operator
		//if(current == positions.length-1){current = 0;}else{current++;}
		$('.menu ul li a').eq(current%$('.menu ul li a').length).trigger('click',[true, true]);
		clearInterval(itvl);
	});
////////////////////////////////////////////////////////////////////

	/* On page load, mark the first thumbnail as active */
	$('.menu ul li.menuItem:first').addClass('act').siblings().addClass('inact');
	
	
	
	/*****
	 *
	 *	Enabling auto-advance.
	 *
	 ****/
	 
	function autoAdvance()
	{
		if(current==-1) return false;
		current++;
		$('.menu ul li a').eq(current%$('.menu ul li a').length).trigger('click',[true, false]);	// [true] will be passed as the keepScroll parameter of the click function on line 28
	}

	// The number of seconds that the slider will auto-advance in:
	var changeEvery = 10;

	var itvl = setInterval(function(){autoAdvance()},changeEvery*1000);
	/* End of customizations */
	
});

////////////////////////////////////////////////////////////////////	


function animateArrows(hitZoneElement){
	var left = document.getElementById('arrow_left');
	var right = document.getElementById('arrow_right');

	left.style.visibility = "visible";
	right.style.visibility = "visible";
	
	hitZoneElement.onmouseout = function(event){
		left.style.visibility = "hidden";
		right.style.visibility = "hidden";
	}
}
////////////////////////////////////////////////////////////////////