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

function turnoff( targetId ){
 if (document.getElementById) {
  target = document.getElementById( targetId );
  if (target.style.display != "none") {
   target.style.display = "none";
  }
 }
}

function turnon( targetId ){
 if (document.getElementById) {
  target = document.getElementById( targetId );
  if (target.style.display == "none") {
   target.style.display = "";
  }
 }
}

function rollon(img_name) {
   document[img_name].src = '/files/images/button-over.gif';
}

function rolloff(img_name) {
   document[img_name].src = '/files/images/button.gif';
}