function toolWindow(page, h, w, tw, sb)
{
  if(!tw) tw = 'tw';
  if(!sb) sb = 'no';
  var s='height='+h+', width='+w+', top='+(screen.height-h)/2+', left='+(screen.width-w)/2+', status='+sb+', scrollbars=yes, resizable=no';
  win=window.open(page, tw, s);
  win.moveTo ((screen.width-w)/2, (screen.height-h)/2);
  win.resizeTo (w, h);
  if(parseInt(navigator.appVersion) >= 4) win.window.focus();
}

function newImage(arg) 
{
  if (document.images) 
  {
    image = new Image();
    image.src = arg;
    return image;
  }
}

function changeImages() 
{
  if (document.images && (preloadFlag == true)) 
    for (var i = 0; i < changeImages.arguments.length; i += 2) 
      document.getElementById(changeImages.arguments[i]).src = changeImages.arguments[i+1];
}

var preloadFlag = false;
function preloadImages() 
{
  if (document.images) 
  {
    arrow_over = newImage("images/arrow-over.gif");
    preloadFlag = true;
  }
}

function changeLanguage (l)
{
  document.language_form.language.value = l;
  document.language_form.submit();
}