title: how to create a multi select box with out selected options codeigniter
body: <p>hi i am using <code>codeigniter</code> , i want to add a <code>multi select box</code> to my page , </p>
  
  <p>i saw the codeigniter user guide example , but what it is doing is set the values in multi select . </p>
  
  <p>like this </p>
  
  <pre><code>$options = array(
                    'small'  =&gt; 'Small Shirt',
                    'med'    =&gt; 'Medium Shirt',
                    'large'   =&gt; 'Large Shirt',
                    'xlarge' =&gt; 'Extra Large Shirt',
                  );
  
  $shirts_on_sale = array('small', 'large');
  
  echo form_dropdown('shirts', $options, $shirts_on_sale);
  </code></pre>
  
  <p>in this multi select box created like this </p>
  
  <pre><code>&lt;select name="shirts" multiple="multiple"&gt;
  &lt;option value="small" selected="selected"&gt;Small Shirt&lt;/option&gt;
  &lt;option value="med"&gt;Medium Shirt&lt;/option&gt;
  &lt;option value="large" selected="selected"&gt;Large Shirt&lt;/option&gt;
  &lt;option value="xlarge"&gt;Extra Large Shirt&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>it have to give the options to be selected in  <code>$shirts_on_sale</code> array , but in my case i want to create a multi select but <code>dont want selected options</code>  i tried to pass an empty array . but it is not working </p>
  
  <p>like this </p>
  
  <pre><code>$array = array();
  echo form_dropdown('shirts', $substore_details, $array); 
  </code></pre>
  
  <p>how to create a multi select with no selected items . please help..............</p>