docs: implement sdk announcement in a collapsible box

  var:sdk.preview.version ?> Platform Highlights</a> document for a list of 

  highlights.</p>

<?cs /if ?> 

<?cs # end if NDK ... the following is for the SDK ?>

  <div class="toggle-content special">

    <p>The Android SDK has changed! If you've worked with the Android SDK before, 

    you will notice several important differences:</p>

    <div class="toggle-content-toggleme" style="display:none">

    <ul>

    <li style="margin-top:.5em">The SDK downloadable package includes <em>only</em>

    the latest version of the Android SDK Tools.</li>

    <li>Once you've installed the SDK, you now use the Android SDK and AVD Manager

    to download all of the SDK components that you need, such as Android platforms,

    SDK add-ons, tools, and documentation. </li>

    <li>The new approach is modular &mdash; you can install only the components you

    need and update any or all components without affecting other parts of your

    development environment.</li>

    <li>In short, once you've installed the new SDK, you will not need to download

    an SDK package again. Instead, you will use the Android SDK and AVD Manager to

    keep your development environment up-to-date. </li>

    </ul>

    <p>If you are currently using the Android 1.6 SDK, you do not need

    to install the new SDK, because your existing SDK includes the Android SDK and

    AVD Manager tool. To develop against Android 2.0, for example, you can

    just download the Android 2.0 platform into your existing SDK. Refer to

    <a href="adding-components.html">Adding SDK Components</a>.</p>

    </div>

    <a href='#' class='toggle-content-button show' onclick="toggleContent(this);return false;">

      <span>show more</span><span style='display:none'>show less</span>

    </a>

  </div>

<p>To get started with the Android SDK, select a package from the table

below and download it to your development computer. Next, install the package

and then use the tools included to download one or more Android platforms, SDK

add-ons, or other components into your SDK. </p>

  <p>If you are new to the Android SDK, please read the <a href="#quickstart">Quick Start</a>,

  below, for an overview of the installation process and how to set up your environment.</p>

<p>Before downloading, please read the <a href="requirements.html">

System Requirements</a> document. As you start the download, you will also need 

to review and agree to the Terms and Conditions that govern the use of the 

Android SDK. </p>

  <table class="download">

    <tr>

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  text-decoration:underline;

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