function ShowSub(id) {
  var e = document.getElementById(id).style;
  var btn = document.getElementById("Btn"+id).style;
  if (e.position == "relative") {   // Hide
    e.position = "absolute";
    e.display = "none";
    btn.backgroundImage = "url(images/i-nav-down.gif)";
    btn.backgroundRepeat = "no-repeat";
    btn.backgroundPosition = "bottom right";
  } else {                          // Show
    e.position = "relative";
    e.display = "block";
    e.width = "100%";               // Hack... In IE6, width gets cleared after click
    btn.backgroundImage = "url(images/i-nav-up.gif)";
    btn.backgroundRepeat = "no-repeat";
    btn.backgroundPosition = "bottom right";
  }
}

function InitSub() {
  var pg=document.location.href.substr(document.location.href.lastIndexOf("/"));
  var section=pg.substr(1,pg.indexOf("-")-1);
  switch (section) {
    case "g":
      ShowSub("Guide");
      break;
    case "f":
      ShowSub("Features");
      break;
    case "d":
      ShowSub("Domain");
      break;
  }
}