JQuery - jquery + php problema ventana modal

<?php

	require_once("class/claseUsuario.php");

	$obj=new claseUsuario();

	$obj=json_decode($_SESSION["usuario"]);

?>

<script src="http://code.jquery.com/jquery-latest.js"></script>

<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>

<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>

<article id="panel">

	<section class="s1">

		<p>PANEL DE CONTROL</p>

	</section>

	<br>

	<section class="s2">

		<div id="sesion">

			&nbsp;<?php echo "Sesión iniciada: ".$obj->nombre." - "; ?>

			<a class="logout" href="includes/logout.inc.php">Cerrar sesión</a>

		</div><br>

		<form method="post" action="includes/panelcontrol.inc.php" name="form" id="form">

			<input type="submit" value="Añadir tabla" />

		</form>

	</section>

</article>

<meta charset="utf-8">

<script type="text/javascript" src="../js/funciones.js" ></script>

<script type="text/javascript" src="../js/jquery-min.js"></script>

<link rel="stylesheet" type="text/css" href="../css/estilos.css">

<script src="http://code.jquery.com/jquery-latest.js"></script>

<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>

<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>

<article id="panel">

	<section class="s1">

		<img src="../img/xaicompanel.png"/>

		<p>PANEL DE CONTROL</p>

	</section>

	<br>

	<section class="s2">

	<div id="tabla" >

		<table id="t1">

			<tr id="botonera">

				<td></td>

				<td class="td1"><input class="btAnadir" onclick="addColumna()" type="button" name="boton" value="+" > </input><input class="btEliminar" onclick="eliminar(this)" type="button" name="boton" value="-" ></input></td>

				<td><input class="btAnadir" onclick="addColumna()" type="button" name="boton" value="+" ></input> <input class="btEliminar" onclick="eliminar()" type="button" name="boton" value="-" ></input></td>

				<td><input class="btAnadir" onclick="addColumna()" type="button" name="boton" value="+" ></input> <input class="btEliminar" onclick="eliminar()" type="button" name="boton" value="-" ></input></td>

				<td><input class="btAnadir" onclick="addColumna()" type="button" name="boton" value="+" ></input> <input class="btEliminar" onclick="eliminar()" type="button" name="boton" value="-" ></input></td>

				<td><input class="btAnadir" onclick="addColumna()" type="button" name="boton" value="+" ></input> <input class="btEliminar" onclick="eliminar()" type="button" name="boton" value="-" ></input></td>

				<td><input class="btAnadir" onclick="addColumna()" type="button" name="boton" value="+" ></input> <input class="btEliminar" onclick="eliminar()" type="button" name="boton" value="-" ></input></td>

			</tr>

			<tr class="cabecera">

				<td><input class="btAnadir" onclick="add()"  type="button" name="boton" value="+" ></input></td>

				<td class="td1"><div contenteditable></div></td>

				<td><div>Muy bien</div></td>

				<td><div>Bien</div></td>

				<td><div>Regular</div></td>

				<td><div>Mal</div></td>

				<td><div>NS/NC</div></td>

			</tr>

		</table>

		<form method="post" action="../" name="form" id="form">

			<input type="submit" value="Guardar" />

		</form>

	</div>

		<div id="ventana" title="Añadir tabla" style="display:none">

			<p>Número de filas</p>

			<select id="numFilas" >

				<option value="1">1</option>

				<option value="2">2</option>

				<option value="3">3</option>

				<option value="4">4</option>

				<option value="5">5</option>

			</select>

			<p>Tipo de fila</p>

			<select id="tipo" >

				<option value="1">Radio Buttons</option>

				<option value="2">Checkbox</option>

				<option value="3">Textarea</option>

			</select>

		</div>

	</section>

</article>

function add(){

	$("#ventana").dialog({

		buttons: {

			Aceptar: function() {

				numFilas = $("#numFilas").val();

				tipo = $("#tipo").val();

				mensaje = "numFilas="+ numFilas +"&tipo=" + tipo;

				$.ajax({

					type: 'get',

					url: '../scripts/nuevatabla.scr.php',

					data: mensaje,

					success: function(data){

						if(data == "1"){

							location.href="./";

						} else {

							alert(data);

						}

					}

				});

			},

			Cancelar: function() {

				$(this).dialog("close");

			}

		}

	});

}

<?php

require_once("../class/conexiondb.php");

include("../class/clasePreguntas.php");

    $numFilas = $_GET['numFilas'];

    $tipo = $_GET['tipo'];

    for($i = 1; $i <= $numFilas; $i++){

        echo "hola"; // esto es solo una prueba, pretendía que "hola" me apareciese en la página

                            // panelcontrol.inc.php pero me aparece en un alert

        echo "1";

    }

?>