在zend中使用javascript onchange事件调用控制器函数

Question

I have an select dropdown list on my view

        <?php $level = $this->escapeHtml($user->level); ?>

        <?php if ($level == 1): ?>
             <option value="1" selected="selected">Administrator</option>
             <option value="2">Manager</option>
             <option value="3">HR Staff</option>
         <?php elseif ($level == 2): ?>
             <option value="1" >Administrator</option>
             <option value="2" selected="selected">Manager</option>
             <option value="3">HR Staff</option>
           <?php elseif ($level == 3): ?>
             <option value="1" >Administrator</option>
             <option value="2" >Manager</option>
             <option value="3" selected="selected">HR Staff</option>
            <?php endif; ?>
        </select>

and it has an onchange event that calls this javascript function

<script type='text/javascript'>

function changeLevel(obj){

}

</script>

and on my controller i have this function

 public function editLevel()
    {
> updating level code here.
    }

What i want is every onchange in my view, i will call my editLevel function in my controller. how can i call a controller function using a javascript onchange? thanks in advance!