$(document).ready(function(){
	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
	$('#menu 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'},450);
		// Start the sliding animation
		e.preventDefault();
		// Prevent the default action of the link
		// Stopping the auto-advance if an icon has been clicked:
		if(!keepScroll) clearInterval(itvl);
	});
	$('#menu 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;
		$('#menu ul li a').eq(current%$('#menu ul li a').length).trigger('click',[true]);	// [true] will be passed as the keepScroll parameter of the click function on line 28
		current++;
	}
	// The number of seconds that the slider will auto-advance in:
	var changeEvery = 15;
	var itvl = setInterval(function(){autoAdvance()},changeEvery*1000);
});