title: toggle() an animate() with jquery
body: <p>this is a super easy question. I know basically what I want and how to do it, I'm jusy not sure what selector to use in a certain part. The animation works fine if I take away the toggle() function, but it only works to open the menu, not to close it.</p>
  
  <p>Here is my jquery code</p>
  
  <pre><code>$(document).ready(function(){
      $('#menu_button').click(function(){
          $(????).toggle(function(){
              $('.sidebar_menu').animate({left:'0'}, 'slow');
              $('.wrapper').animate({'margin-left':'250px'}, 'slow');
          });
  
      })
  });
  </code></pre>
  
  <p>And here is my page code:</p>
  
  <pre><code>&lt;div class="sidebar_menu"&gt;
          &lt;h2&gt;Menu&lt;/h2&gt;
          &lt;h3&gt;1. Escolher produto&lt;/h3&gt;
          &lt;ul&gt;
              &lt;li&gt;Entradas&lt;/li&gt;
              &lt;li&gt;Peixe&lt;/li&gt;
              &lt;li&gt;Saladas&lt;/li&gt;
          &lt;/ul&gt;
          &lt;h3&gt;2. Preencher dados&lt;/h3&gt;
          &lt;h3&gt;3. Finalizar pedido&lt;/h3&gt;
      &lt;/div&gt;
  
      &lt;div class="wrapper"&gt;
              &lt;header&gt;
                  &lt;button id="menu_button"&gt;menu&lt;/button&gt;
              &lt;/header&gt;
     &lt;/div&gt;
  </code></pre>
  
  <p>And my CSS:</p>
  
  <pre><code>html, body, div, span, applet, object, iframe,
  h1, h2, h3, h4, h5, h6, p, blockquote, pre,
  a, abbr, acronym, address, big, cite, code,
  del, dfn, em, img, ins, kbd, q, s, samp,
  small, strike, strong, sub, sup, tt, var,
  b, u, i, center,
  dl, dt, dd, ol, ul, li,
  fieldset, form, label, legend,
  table, caption, tbody, tfoot, thead, tr, th, td,
  article, aside, canvas, details, embed, 
  figure, figcaption, footer, header, hgroup, 
  menu, nav, output, ruby, section, summary,
  time, mark, audio, video {
      margin: 0;
      padding: 0;
      border: 0;
      font-size: 100%;
      font: inherit;
      vertical-align: baseline;
  }
  /* HTML5 display-role reset for older browsers */
  article, aside, details, figcaption, figure, 
  footer, header, hgroup, menu, nav, section {
      display: block;
  }
  body {
      line-height: 1;
  }
  blockquote, q {
      quotes: none;
  }
  blockquote:before, blockquote:after,
  q:before, q:after {
      content: '';
      content: none;
  }
  table {
      border-collapse: collapse;
      border-spacing: 0;
  }
  
  
  /**MAIN STYLES**/
  body {
      height: 100%;
      width: 100%;
      background-color:#C00;
  }
  .sidebar_menu {
      width: 25%;
      height: 100%;
      display:block;
      position:fixed;
      left: 0;
      top: 0;
      background-color: #666;
  }
  .wrapper {
      width: 75%;
      float:left;
      margin-left: 25%;
      background-color:#C00;
  }
  .menu_button {
      display:none;
      }
  
      .slideIn {
          background-color: #090;
      }
  
  @media screen and (max-width: 50em){
      .sidebar_menu {
          width: 250px;
          left: -250px;
      }
      .wrapper {
          width: 100%;
          margin-left: 0;
      }
      #menu_button {
          display:block;
      }
  }
  </code></pre>