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