jQuery(function($) {

			var counter = { value: 0 };
			var $inputs = $('#order input[type="text"][name^="wielkosc"]');
			var $counter = $('#order div > tt');

			var count = function(e, c) {
				c.value = 0;
				e.each(function() {
					var count = parseInt(this.value, 10);
					c.value += !isNaN(count) ? count : 0;
				});
				$counter.text(c.value);
			};

			count($inputs, counter);
			$inputs.keyup(function() {
				count($inputs, counter);
			});

		});