using selectors in jquery

<div id="myDiv">
       my div text
   </div>
   <input type="text" id="txt1" />
   <select id="ddl1">
       <option value="1">Test</option>
       <option value="2">Test 2</option>
   </select>
   <input type="checkbox" id="chk1" /><label for="chk1">Check Box</label>

   <input type="button" id="btn1" value="Get Value" onclick="GetValues();"/>

<script type="text/javascript">
      function GetValues() {
          alert("my DIV content is " + $('#myDiv').html());
          alert("my text box value is " + $('#txt1').val());
          alert("my dropdownlist selected text is " + $('#ddl1 option:selected').text());
          alert("my checkbox is " + $('#chk1').attr('checked'));
      }
  </script>