title: Javascript "MULTIPLE Selection" Select box validation?
body: <p>I Have a Multiple selection select box. I need it to be validated using javascript, so that it should prompt to select atleast one value.</p>
  
  <p>Below is the multiple select box I Have.</p>
  
  <pre><code>&lt;select name="usrgrp[]" multiple="multiple" size="3"&gt;
  &lt;option value="11"&gt;abc&lt;/option&gt;
  &lt;option value="12"&gt;def&lt;/option&gt;
  &lt;option value="13"&gt;ghi&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>Please help me to write the validation javascript for this select box.</p>