Usando este código no me marca nada
Código:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Demo: In your language | Quizzpot</title>
<link rel="stylesheet" type="text/css" href="../extjs/resources/css/ext-all.css" />
<link rel="stylesheet" type="text/css" href="../resources/style.css" />
<script type="text/javascript" src="../extjs/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="../extjs/ext-all.js"></script>
<script type="text/javascript" src="ExtStart.js"></script>
</head>
<body>
<h1>Introduction to Ext: Starter Page</h1>
<p>This is the starter page that accompanies the Introduction to Ext tutorial located at <a href="http://www.extjs.com/tutorial/introduction-ext">http://www.extjs.com/tutorial/introduction-ext</a>.</p>
<p>This page is intended to help you interactively explore some of the capabilities of the Ext library, so please make sure that your script references are correct. This page assumes by default that it is in a directory directly beneath the root Ext deployment directory. For example, if your Ext directory structure is located at "C:\code\Ext\v1.0\," then this file should be saved in a directory like "C:\code\Ext\v1.0\tutorial\." If you choose to locate this file somewhere else, then make sure you change the script references of this file as needed.</p>
<p>If you have any questions or issues getting this tutorial to work correctly, please stop by the <a href="http://www.extjs.com/forums/">Ext Forums</a> and ask for help!</p>
<div id="myDiv">This is a test div.</div>
<input type="button" id="myButton" value="My Button" />
<div id="grid-example" style="overflow: hidden; width: 535px; height: 125px;border:2px solid #999;margin:20px 50px;visibility:hidden;"></div>
</body>
</html>
con tu mismo JS, creo que el problema es que no incluiste lo necesario para trabajar, usa la llamada a los JS en el orden que esta y si funciona solo cambia la ruta de su localización....