$(document).ready(function(){

	(function($){
		$.fn.clearDefault = function(){
			return this.each(function(){
				var default_value = $(this).val();
				$(this).focus(function(){
					if ($(this).val() == default_value) $(this).val("");
				});
				$(this).blur(function(){
					if ($(this).val() == "") $(this).val(default_value);
				});
			});
		};
	})(jQuery);
	
	
	
	var currentPosition = 0;
	var slideWidth = 500;
	var slides = $('.slide');
	var numberOfSlides = slides.length;

	// Remove scrollbar in JS
	$('#slidesContainer').css('overflow', 'hidden');
	// Wrap all .slides with #slideInner div
	slides.wrapAll('<div id="slideInner"></div>')

	// Float left to display horizontally, readjust .slides width
	.css({
		'float' : 'left',
		'width' : slideWidth
	});

	// Set #slideInner width equal to total width of all slides
	$('#slideInner').css('width', slideWidth * numberOfSlides);
	
	// Insert controls in the DOM
	$('#slideshow')
	.prepend('<span class="control" id="leftControl">Clicking moves left</span>')
	.append('<span class="control" id="rightControl">Clicking moves right</span>');
	
	// Hide left arrow control on first load
	manageControls(currentPosition);

	// Create event listeners for .controls clicks
	$('.control').bind('click', function(){

		// Determine new position
		currentPosition = ($(this).attr('id')=='rightControl') ? currentPosition+1 : currentPosition-1;

		// Hide / show controls
		manageControls(currentPosition);
		// Move slideInner using margin-left
		$('#slideInner').animate({
			'marginLeft' : slideWidth*(-currentPosition)
		});
	});
	// manageControls: Hides and Shows controls depending on currentPosition
	function manageControls(position){
		// Hide left arrow if position is first slide
		if(position==0){ $('#leftControl').hide() } else{ $('#leftControl').show() }
		// Hide right arrow if position is last slide
		if(position==numberOfSlides-1){ $('#rightControl').hide() } else{ $('#rightControl').show() }
	}	
	
});