<FORM name="degistir">
<select size="1" name="navigation" onChange="window.location=document.degistir.navigation.options[document.degistir.navigation.selectedIndex].value">
<option value="#">Seç</option>
<option value="sayfa1.asp">Sayfa1</option>
<option value="sayfa2.asp">sayfa2</option>
</select>
</FORM>