//function toggleLayer( whichLayer ) {
function toggleLayer( sourceID, targetID, button ) {
  if(button) {
    setButton(button);
  };
  document.getElementById(targetID).innerHTML = '<div class="formtextInner">' + document.getElementById(sourceID).innerHTML + '</div>';
}

function setButton(button){
// unset 'active' id for all tabs
  var commonTabClass="tab";
  var activeTabClass="tabactive";

  if(typeof(button) != 'undefined' ){
   var tabsBlock=button.parentNode;
   var tabs = tabsBlock.getElementsByTagName("a");
       for (var h = 0; h < tabs.length; h++) {
         tabs[h].className = commonTabClass;
       }

   // Then set 'active' id for clicked tab
   button.className += " "+activeTabClass;
   button.blur();
  }
}