$(document).ready(function(){
	
	var changeEvery = 5; // The number of seconds that each slide shows before advancing
	var totalSlides = 9; // The total number of slides
	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;
		}
	});
	
	$('#slides').width(totWidth);

	/* Change the cotnainer div's width to the exact width of all the slides combined */
	$('#menu1 ul li a').click(function(e,keepScroll){
			/* On a thumbnail click */
			$('li.menuItem').removeClass('act').addClass('inact');
			$(this).parent().addClass('act');
			
			var pos = $(this).parent().prevAll('.menuItem').length;
			
			$('#slides').stop().animate({marginLeft:-positions[pos]+'px'},400); // Start the sliding animation
			e.preventDefault(); // Prevent the default action of the link
			if(!keepScroll) clearInterval(itvl); // Stopping the auto-advance if an icon has been clicked
	});
	
	$('#menu1 ul li.menuItem:first').addClass('act').siblings().addClass('inact'); // On page load, mark the first thumbnail as active
	
	/* Enabling auto-advance. */
	var current=1;
	function autoAdvance() {
		if(current==-1) return false;
		$('#menu1 ul li a').eq(current%$('#menu1 ul li a').length).trigger('click',[true]);	// [true] will be passed as the keepScroll parameter of the click function on line 28
		current++;
		
		if(current==totalSlides) clearInterval(itvl); // Stopping the auto-advance when the last slide is reached
	}

	var itvl = setInterval(function(){autoAdvance()},changeEvery*1000);
});