$.fn.imagesSlider = function (opts) {
	var opts = $.extend({
		touch_speed: 1, 
		step: 50, // px
		duration: 700
	}, opts);
	
	var el = this;
	
	var $wrap = el.find('.photos_slider-wrap'),	
		$prev = el.find('.photos_slider-prev'),
		$next = el.find('.photos_slider-next'), 
		is_overflow, last_x, last_scroll;
	if (!$wrap.length) {
		el.children().wrapAll('<div class="photos_slider-wrap"></div>');
		
		$prev = $('<div class="photos_slider-prev"><div></div></div>');
		$next = $('<div class="photos_slider-next"><div></div></div>');
		el.addClass('photos_slider').append($prev).append($next);
		
		$wrap = el.find('.photos_slider-wrap');
		
		function move(pos, scroll) {
			var new_scroll = Math.floor(Math.max(0, (typeof scroll == "number" ? scroll : $wrap.scrollLeft()) + pos));
			$wrap.scrollLeft(new_scroll);
			
			$prev.toggle($wrap.scrollLeft() > 0);
			if (pos < 0) {
				$next.show();
			} else {
				$next.toggle(new_scroll == Math.floor($wrap.scrollLeft()));
			}
		}
		
		$prev.on('click', function (e) {
			e.preventDefault();
			move(-opts.step);
			$next.show();
		});
		$next.on('click', function (e) {
			e.preventDefault();
			move(opts.step);
		});
		$wrap.on('touchstart', function (e) {
			var touches = e.originalEvent.touches;
			if (touches.length > 1)
				return;
			
			last_x = touches[0].clientX, 
			last_scroll = $wrap.scrollLeft();
		});
		$wrap.on('touchmove', function (e) {
			e.stopPropagation();
			
			var touches = e.originalEvent.touches;
			if (touches.length > 1)
				return;
			
			var x = touches[0].clientX;
			move((last_x - x) * opts.touch_speed, last_scroll);
			
			return false;
		});
	}
	
	var last = $wrap.children().addClass('photos_slider-item').last();
	is_overflow = (($wrap.offset().left + $wrap.innerWidth()) <= (last.offset().left + last.outerWidth()));
	
	$next.toggle(is_overflow);
	$prev.hide();
	
	return this;
};