i want to disable "--Pick Up--" and "--All locations--" i am using drorpdwon
<select name="ddlpickuplocation" onchange="javascript:setTimeout('__doPostBack(\'ddlpickuplocation\',\'\')', 0)" id="ddlpickuplocation" tabindex="1" class="width320">
<optgroup label="california">
<option selected="selected" value="--Pick Up--">--Pick Up--</option>
<option value="LOS ANGELES AIRPORT (LAX)">LOS ANGELES AIRPORT (LAX)</option>
<option value="SAN DIEGO AIRPORT (SAN)">SAN DIEGO AIRPORT (SAN)</option>
<option value="SAN FRANCISCO AIRPORT (SFO)">SAN FRANCISCO AIRPORT (SFO)</option>
<option valu ...
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