Simply in jQuery (a Javascript framework - Write less, do more):
$("#div_id <a href="option:first).attr(" class="autolinkedURL autolinkedURL-url" target="_blank">option:first).attr(</a>"selected","selected"); 
Example: 
$('#myCombo').load(
 'my_combo.php?foo=bar',
 function() {
 $('#myCombo <a href="option:first).attr(" class="autolinkedURL autolinkedURL-url" target="_blank">option:first).attr(</a>"selected","selected");
 }
 );
html:


Simply in jQuery (a Javascript framework - Write less, do more):

$("#div\_id option:first).attr("selected","selected"); 

Example: 

$('#myCombo').load(
                              'my\_combo.php?foo=bar',
                               function() {
                                     $('#myCombo option:first).attr("selected","selected");
                               }
                      );
html:


How to select the first option in a combo box?

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How to select the first option in a combo box?