$(document).ready(function(){
	var totWidth=0;
	var positions = new Array();
	
	/* Loop through all the slides and store their accumulative widths in totWidth */
	$('#slides .slide').each(function(i){		
		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);
	
	/* On a thumbnail click */
	$('#tb_menu ul li a').click(function(e){
		$('li.menuItem').removeClass('act').addClass('inact');
		$(this).parent().addClass('act');
		var pos = $(this).parent().prevAll('.menuItem').length;
		/* Start the sliding animation */
		$('#slides').stop().animate({marginLeft:-positions[pos]+'px'},450);
		/* Prevent the default action of the link */
		e.preventDefault();
	});
	/* On page load, mark the first thumbnail as active */
	$('#tb_menu ul li.menuItem:first').addClass('act').siblings().addClass('inact');
});