Поиск по зависимым полям - AdsManager

<script type="text/javascript">
          function showDiv(elem){
   if(elem.value == 0)
      document.getElementById('tr_ad_lowmonth').style.display = "block";
      else
      document.getElementById('tr_ad_lowmonth').style.display = "none";
   if(elem.value == 1)
      document.getElementById('tr_ad_lowweek').style.display = "block";
      else
      document.getElementById('tr_ad_lowweek').style.display = "none";
   if(elem.value == 2)
      document.getElementById('tr_ad_lowday').style.display = "block";
      else
      document.getElementById('tr_ad_lowday').style.display = "none";
   
        }
       </script>

 <select id="test" name="form_select" onchange="showDiv(this)">
           <option value ="hui">Nothing</option>
           <option value="0">Month</option>
           <option value ="1">Week</option>
           <option value ="2">Day</option>
        </select>

			
			<?php 
			foreach($this->searchfields as $fsearch) {
				$title = $this->field->showFieldTitle($this->catid,$fsearch);
				echo "<div id='tr_".$fsearch->name."'>".htmlspecialchars($title)."";
				$this->field->showFieldSearch($fsearch,$this->catid,null);
				echo "</div>";
			}?>