How do I programatically select an HTML option using JavaScript?

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I have option menu like this:

<form name="AddAndEdit">
   <select name="list" id="personlist">
      <option value="11">Person1</option>
      <option value="27">Person2</option>
      <option value="17">Person3</option>
      <option value="10">Person4</option>
      <option value="7">Person5</option>
      <option value="32">Person6</option>
      <option value="18">Person7</option>
      <option value="29">Person8</option>
      <option value="28">Person9</option>
      <option value="34">Person10</option>
      <option value="12">Person11</option>
      <option value="19">Person12</option>
   </select>
</form>

And now I want to change the selected option by using an href. For example:

<a href="https://stackoverflow.com/questions/10911526/javascript:void(0);"
  onclick="document.getElementById('personlist').getElementsByTagName('option')[11].selected = 'selected';">change</a>

But I want to select the option with value=11 (Person1), not Person12.

How do I change this code?

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