$AOL_FL$

<select name="aol">
<option value="0">ОС не выбрана</option>
<option value="1">Windows XP</option>
<option value="2">Windows 7</option>
<option value="3">Windows 8</option>
</select>

<?if($код-AOL$='1')?>Windows XP<?else?><?if($код-AOL$='2')?>Windows 7<?else?><?if($код-AOL$='3')?>Windows 8<?else?>ОС не выбрана<?endif?><?endif?><?endif?>

<select name="aol">
  <option value="0" <?if(substr(substr($AOL_FL$,strpos($AOL_FL$,'value')+7),0,1)='0')?>selected="selected"<?endif?>>ОС не выбрана</option>
  <option value="1" <?if(substr(substr($AOL_FL$,strpos($AOL_FL$,'value')+7),0,1)='1')?>selected="selected"<?endif?>>Windows XP</option>
  <option value="2" <?if(substr(substr($AOL_FL$,strpos($AOL_FL$,'value')+7),0,1)='2')?>selected="selected"<?endif?>>Windows 7</option>
  <option value="3" <?if(substr(substr($AOL_FL$,strpos($AOL_FL$,'value')+7),0,1)='3')?>selected="selected"<?endif?>>Windows 8</option>
  </select>