How can I hide/show a div when a button is clicked?

I have a div that contains a register wizard, and I need hide/show this div when a button is clicked. How can I do this?

Below I show you the code.

Thanks :)

  <div id="wizard" class="swMain">
    <ul>
      <li><a href="#step-1">
            <label class="stepNumber">1</label>
        </a></li>
      <li><a href="#step-2">
            <label class="stepNumber">2</label>
        </a></li>
      <li><a href="#step-3">
            <label class="stepNumber">3</label>
         </a></li>
      <li><a href="#step-4">
            <label class="stepNumber">4</label>
        </a></li>
    </ul>
    <div id="step-1"> 
        <h2 class="StepTitle">Perfil</h2>
        <table cellspacing="3" cellpadding="3" align="center">
            <tr>
                  <td align="center" colspan="3">&nbsp;</td>
            </tr>        
            <tr>
                  <td align="right">Username :</td>
                  <td align="left">
                    <input type="text" id="username" name="username" value="" class="txtBox">
                  </td>
                  <td align="left"><span id="msg_username"></span>&nbsp;</td>
            </tr>
            <tr>
                  <td align="right">Password :</td>
                  <td align="left">
                    <input type="password" id="password" name="password" value="" class="txtBox">
                  </td>
                  <td align="left"><span id="msg_password"></span>&nbsp;</td>
            </tr>                                          
       </table>               
    </div>

Solution

Use JQuery. You need to set-up a click event on your button which will toggle the visibility of your wizard div.

$('#btn').click(function() {
    $('#wizard').toggle();
});

Refer to the JQuery website for more information.

This can also be done without JQuery. Using only standard JavaScript:

<script type="text/javascript">
   function toggle_visibility(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'block')
          e.style.display = 'none';
       else
          e.style.display = 'block';
   }
</script>

Then add onclick="toggle_visibility('id_of_element_to_toggle');" to the button that is used to show and hide the div.