// JavaScript Document

 function hideSelects() {
   var selects = document.getElementsByTagName("SELECT");
   for (var i=0; i<selects.length; i++) {
    var oneSelect = selects[i];
    oneSelect.style.visibility = 'hidden';
   }
  }

  function showSelects() {
   var selects = document.getElementsByTagName("SELECT");
   for (var i=0; i<selects.length; i++) {
    var oneSelect = selects[i];
    oneSelect.style.visibility = 'visible';
   }
  }