// I have no idea what this is for, but everyone uses it
function SymError() {
  return true;
}
window.onerror = SymError;
var SymRealWinOpen = window.open;
function SymWinOpen(url, name, attributes) {
  return (new Object());
}
window.open = SymWinOpen;

// Preload all images
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}
var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		nav_button_over = newImage("images/nav_button-over.jpg");
		preloadFlag = true;
	}
}
function setButton (id, imageURL) {
  if (document.layers)
    document[id].background.src = imageURL == 'none' ? null : imageURL;
  else if (document.all)
    document.all[id].style.backgroundImage = imageURL == 'none' ? 'none' 
: 'url(' + imageURL + ')';
  else if (document.getElementById)
    document.getElementById(id).style.backgroundImage = imageURL == 
'none' ? 'none' : 'url(' + imageURL + ')';
}