title: after clicking on checkbox a text box will appear
body: <pre><code>&lt;script type="text/javascript" language="javascript"&gt;
  function enabletxt(){
      document.getElementById("chkAssociation").innerHTML="&lt;input type='text' value=''&gt;"
  }
  &lt;/script&gt;
  Hobbies:  &lt;input type="checkbox" name="hobbies" value="Dancing"&gt;Dancing
  &lt;input type="checkbox" name="hobbies" value="Painting"&gt;Painting
  &lt;input type="checkbox" name="hobbies" value="Others" onChange="javascript:enabletxt();" ID="chkAssociation"  runat="server" /&gt;Others
  </code></pre>