让下拉菜单可以选择也可以填写

<INPUT name=la id=la style='width:82'>

<span style='width:18;'>

<select style='margin-left:-82;width:100' onchange="document.getElementById('la').value=options[selectedIndex].value">
<option value="111">111</option>
<option value="222">222</option>
<option value="333">333</option>
</select>

</span>