Javascript "MULTIPLE Selection" Select box validation? -

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i have multiple selection select box. need validated using javascript, should prompt select atleast 1 value.

below multiple select box have.

<select name="usrgrp[]" multiple="multiple" size="3"> <option value="11">abc</option> <option value="12">def</option> <option value="13">ghi</option> </select>

please me write validation javascript select box.

if (referencetoform.elements["usrgrp[]"].selectedindex == -1) {   alert("please select item."); }

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