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<!-- Onchange open URL via select - jQuery -->

<script>
  $(function() {
    // bind change event to select
    $('#dynamic_select').on('change', function() {
      var url = $(this).val(); // get selected value
      if (url) { // require a URL
        window.location = url; // redirect
      }
      return false;
    });
  });
</script>

<select id="dynamic_select">
  <option value="" selected>Pick a Website</option>
  <option value="http://www.google.com">Google</option>
  <option value="http://www.youtube.com">YouTube</option>
  <option value="https://www.gurustop.net">GuruStop.NET</option>
</select>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

<!-- http://stackoverflow.com/questions/5150363/onchange-open-url-via-select-jquery -->