/*
 * PageUp/Down handler
 *
 * Copyright (C) Cestovatel.cz, 2006
 *
 * Pizzaware: order pizza for Veros Kaplan before using
 *
 */

var url_prevUrl = undefined;
var url_nextUrl = undefined;

function registerPageUpDownHandler() {
  var oldload = window.onload;
  if (oldload) {
  	window.onload = function(caller) {
		oldload(caller); 
		document.onkeydown = keypresshandler;
	}
  } else {
  	window.onload = function(caller) {
		document.onkeydown = keypresshandler;
	}
 }
}

function keypresshandler(e) {
//  if (event.shiftKey)
//  	return true;
  xevent = (e) ? e : window.event;
  keyCode =  (e) ? e.keyCode : event.keyCode;
  if (keyCode == 34) { // page down
  	if (url_nextUrl) {
		document.location = url_nextUrl;
		xevent.returnValue = false;
		return false;
	}
  } else if (keyCode == 33) { // page up
  	if (url_prevUrl) {
		document.location = url_prevUrl;
		xevent.returnValue = false;
		return false;
	}
  }
  xevent.returnValue = true;
  return true;
}

registerPageUpDownHandler();