var winW = 630, winH = 460;
var image, fullwidth, fullheight;
var text_level = 2;

function set_size() {
  if (parseInt(navigator.appVersion)>3) {
    if (navigator.appName=="Netscape") {
      winW = window.innerWidth;
      winH = window.innerHeight;
    }
    if (navigator.appName.indexOf("Microsoft")!=-1) {
      winW = document.body.offsetWidth;
      winH = document.body.offsetHeight;
    }
  }
  ratio=Math.min(winW/fullwidth, winH/fullheight);
  image.width=ratio*fullwidth;
  image.height=ratio*fullheight;
  image.vspace=((winH-image.height)/2);
}

function resized() {
  set_size()
}

function loaded() {
  image = document.getElementById("image");
  fullwidth = image.width;
  fullheight = image.height;
  set_size()
}

function set_visibility(id, level) {
  var el = document.getElementById(id);
  if (text_level >= level) el.style.display = 'inline';
  else el.style.display = 'none';
}

function set_textmode() {
  set_visibility("NormalNavigation", 1);
  set_visibility("MinimalNavigation", 0);
  set_visibility("LowerLeft", 1);
  set_visibility("UpperLeft", 1);
  set_visibility("LowerRight", 1);
}

function keypressed(e)
{
  var keynum
  var key

  if(window.event) { keynum = e.keyCode } // IE
  else if(e.which) { keynum = e.which } // Netscape/Firefox/Opera
  key = String.fromCharCode(keynum);
  keyaction(key);
}

function keyaction(key) {
  if (key == 'r') {document.location = "random.php"}
  if (key == 'f') {document.location = "origs/"+page}
  if (key == 'p' && previous != "") {document.location = "show?page="+previous}
  if (key == 'n' && next != "") {document.location = "show?page="+next}
  if (key == 't') {
    ++text_level; if (text_level >= 2) text_level=0;
    set_textmode()
  }
}