// toggle visibility
  
  function toggle( targetId ){
    if (document.getElementById){
          target = document.getElementById( targetId );
             if (target.style.display == "none"){
                target.style.display = "";
             } else {
                target.style.display = "none";
             }
       }
  }

  // toggle all
  
  function toggleAll ( choice ) {
    var alltags = document.getElementsByTagName("*"); 
    for (i=0; i < alltags.length; i++){
      var theTag = alltags[i];
      var name = theTag.getAttribute("id");
      if ( name != null && name.substr(0, 3) == "tog") {
        if (choice == "openall" ) {
          theTag.style.display = "";  
        }
        else {
          theTag.style.display = "none";
        }        
      }     
    }
  }