請問如果用選單假設選了5

讓DIV內容中只要有用到的變數也都變成5
以下是javascript

script ID=clientEventHandlersJS language=javascript
function showdiv(ele)
  {
      var Value = ele.options[ele.options.selectedIndex].value;
      var sbtitle2 = document.getElementById('divtag2');
      var sbtitle3 = document.getElementById('divtag3');
      var sbtitle4 = document.getElementById('divtag4');
      var sbtitle5 = document.getElementById('divtag5');
      var sbtitle6 = document.getElementById('divtag6');
      var sbtitle7 = document.getElementById('divtag7');
      var sbtitle8 = document.getElementById('divtag8');
      var sbtitle9 = document.getElementById('divtag9');
      var sbtitle10 = document.getElementById('divtag10');
      var sbtitle11 = document.getElementById('divtag11');
      var sbtitle12 = document.getElementById('divtag12');
      var sbtitle13 = document.getElementById('divtag13');
      var sbtitle14 = document.getElementById('divtag14');
      var sbtitle15 = document.getElementById('divtag15');
      if ( Value == 1 )
      {
          sbtitle2.style.display = 'none';
          sbtitle3.style.display = 'none';
          sbtitle4.style.display = 'none';
          sbtitle5.style.display = 'none';
          sbtitle6.style.display = 'none';
          sbtitle7.style.display = 'none';
          sbtitle8.style.display = 'none';
          sbtitle9.style.display = 'none';
          sbtitle10.style.display = 'none';
          sbtitle11.style.display = 'none';
          sbtitle12.style.display = 'none';
          sbtitle13.style.display = 'none';
          sbtitle14.style.display = 'none';
          sbtitle15.style.display = 'none';
      }
      else if ( Value == 2 )
   }
</script>