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

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

var preloadFlag = false;
function preloadImages() {
 if (document.images) {
  home_over = newImage("i/nav2/home-over.png");
  productions_over = newImage("i/nav2/productions-over.png");
  support_over = newImage("i/nav2/support-over.png");
  directions_over = newImage("i/nav2/directions-over.png");
  about_over = newImage("i/nav2/about-over.png");
  contact_over = newImage("i/nav2/contact-over.png");
  preloadFlag = true;
 }
} 

// From http://www.netlobo.com/url_query_string_javascript.html
function gup( name )
{
  var regexS = "[\\?&]"+name+"=([^&#]*)";
  var regex = new RegExp( regexS );
  var tmpURL = window.location.href;
  var results = regex.exec( tmpURL );
  if( results == null )
    return "";
  else
    return results[1];
}