twitter bootstrap - How can i open the drop-down using jquery -

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i using phonegap , bootstrap. how can open select using jquery?

<select class="selectpicker" data-width="100%" name="selvalue" id="msg_counts_id">     <option value="" >select</option>     <option value="1">you</option>     <option value="2">are</option>     <option value="3">my...</option> </select>


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