drop down meni -otvaranje novog prozora

Code:
<form name="fn">
    <select name="sn" size="1" style="font-family: Arial; font-weight: bold; color: #660033"
      onChange="window.location=document.fn.sn.options[document.fn.sn.selectedIndex].value">
      <option selected>&nbsp;Izaberi opciju
      <option value="http://wdvl.internet.com/Authoring/JavaScript/Tutorial/">Javascript tutorial
      <option value="http://www.zend.com/zend/tut/tutorial-yank.php">PHP - sa primerom (Joke)
    </select>
    </form>

Code:
<form method="post" action="" name="">
<select name="select15" onChange="window.open(this.options[this.selectedIndex].value,'_blank')">
<option selected="selected" value="">Izaberi</option>
<option value="http://www.google.com/">Link 1</option>
<option value="http://www.google.com/">Link 2</option>
</select>
</form>