$(document).ready(function(){
	/* This code is executed after the DOM has been completely loaded */
	
	var totWidth=0;
	var positions = new Array();
	var pos = 0;
	var plenght;
	
	$('#slides .slide').each(function(i){
		
		/* Traverse through all the slides and store their accumulative widths in totWidth */
		
		positions[i]= totWidth;
		totWidth += $(this).width();
		plenght = i;
		/* 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;
		}
		
	});
	
	$('#slides').width(totWidth);

	/* Change the cotnainer div's width to the exact width of all the slides combined */

	$('#menu ul li a').click(function(e){

			/* On a thumbnail click */

			$('li.menuItem').removeClass('act').addClass('inact');
			$(this).parent().removeClass('inact').addClass('act');
			
			var pos = $(this).parent().prevAll('.menuItem').length;

			$('#slides').stop().animate({left:-positions[pos]},450);
			
			/* Start the sliding animation */
			
			e.preventDefault();
			/* Prevent the default action of the link */
	});
	
	/* next event */
	$('#next').click(function(e){
			pos = pos + 1;
			if(pos > plenght)
				pos = 0
			$('#slides').stop().animate({left:-positions[pos]+'px'},450);
			/* Start the sliding animation */

			e.preventDefault();
			/* Prevent the default action of the link */
	});
	
	/* prev event */
	$('#prev img').click(function(e){
			pos = pos - 1;
			if(pos < 0)
				pos = plenght
			$('#slides').stop().animate({left:-positions[pos]+'px'},450);
			/* Start the sliding animation */
			
			e.preventDefault();
			/* Prevent the default action of the link */
	});
	
	$('#menu ul li.menuItem:first').addClass('act').siblings().addClass('inact');
	/* On page load, mark the first thumbnail as active */

//prepare slides for fade effect
$('.slide:first').fadeIn(1500);

	function slide(){
		$('.slide:eq('+pos+')').fadeOut(1500);
		pos = pos + 1;
		if(pos > plenght)
			pos = 0;
		$('.slide:eq('+pos+')').fadeIn(1500);
	}

	setInterval(slide,6000);

});