$(document).ready(
	function() 
	{
		$('#cost_calculator form').submit(function() {
					$.ajax({
						type: "post",
						url: $(this).attr("action"),
						data: {length: $("input[@name='length']").val(), diameter: $("select[@name='diameter'] option:selected").val(), type: $("select[@name='type'] option:selected").val()},
						dataType: "html",
						error:	function(r) { alert(r) },
						success: function(r) { 	$("#final_price").html(r); }
					});
					return false;
		});

});