Сохранение значения disabled при возврате к форме

<script>
 function Selected(a) {
     var level = a.value;
     if (level==1) {$(".block").attr('disabled', false);}
     else if (level==2) {$(".block").attr('disabled', false);}
     else if (level==3) {$(".block").attr('disabled', false);}
     else {$(".block").attr('disabled', true);}
     }
</script>
...
<p>Род занятий</p>
<select id="PamphletRequestJob" name="job" onChange="Selected(this)">
     <option value="">Ваш род занятий</option>
     <?php foreach ( $jobs as  $job_id => $job_name ):?>
     <option value="<?=$job_id?>" <?=$this->_request['job']==$job_id ? "selected" : "" ?>><?=$job_name?>   </option>
     <?php endforeach;?>
</select>        
  
<p>Название школы</p>
        
<p>Район</p>
<select id="PamphletRequestHighschoolPrefectureId" name="highschool_prefecture_id" class="block" disabled>
     <option value="" >Где находится Ваша школа</option>
     <?php foreach ( $prefectures as  $prefecture_id => $prefecture_name ):?>
     <option <?=$this->_request['highschool_prefecture_id']==$prefecture_id ? "selected" : "" ?> value="<?=$prefecture_id?>"><?=$prefecture_name?></option>
     <?php endforeach;?>
</select>
 
<p>Вид школы</p>
<select id="PamphletRequestHighschoolFounderId" name="highschool_founder_id" class="block" disabled>
     <option value="0">Вид школы</option>
     <?php foreach ( $high_school_founders as  $high_school_founder_id => $high_school_founder_name ):?>
     <option value="<?=$high_school_founder_id?>"   <?=$this->_request['highschool_founder_id']==$high_school_founder_id ? "selected" : "" ?>><?=$high_school_founder_name?></option>
     <?php endforeach;?>
</select>
 
<p>Название школы</p>
     <input id="PamphletRequestHighschoolName" type="text" name="highschool_name" value="<?=$this->_request['highschool_name']?>" class="block" disabled>