SO - 19086737

HTML

<form>
    <select name='PreviousReceiver' onchange="javascript: if(this.value != '0') this.form.submit(); alert('this.value'); else alert('hello');" >
        <option value='0'>Contact List</option>
        <option value='1'>blah</option>
        <option value='2' selected>blah2</option>
        <option value='3'>blah3</option>
    </select>
</form>