/* This script and many more are available free online at
The JavaScript Source :: http://javascript.internet.com
Created by: Pete McVicar :: http://www.alistapart.com/articles/printtopreview */

function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

addLoadEvent( function(){ add_print_link( 'nav' ) } );

function add_print_link( id ){
  if( !document.getElementById ||
      !document.getElementById( id ) ) return;

  // add extra functions to page tools list
  var print_page = document.getElementById( id );

  // create print link
  var print_function = document.createElement('p');
  print_function.className = 'print-link';
  print_function.onclick = function(){ print_preview(); return false; };
  print_function.appendChild( document.createTextNode( 'Print the Page' ) );

}

function print_preview() {
// Switch the stylesheet
setActiveStyleSheet('Print Preview');

// Create preview message
add_preview_message();

// Print the page
window.print();
}

function add_preview_message(){
var main_content = document.getElementById('header');
var main_body = main_content.parentNode;

if (document.getElementById){

var preview_message = document.createElement('div');
preview_message.id = 'preview-message';

// Create Heading
var preview_header = document.createElement('h3');
var preview_header_text = document.createTextNode('This is a print preview of this page');
preview_header.appendChild(preview_header_text);

// Create paragraph
var preview_para = document.createElement('p');

var cancel_function_link = document.createElement('a');
cancel_function_link.onclick = function(){ cancel_print_preview(); return false; };
cancel_function_link.setAttribute('href', '#');
var cancel_function_link_text = document.createTextNode('Return to the website page.');
cancel_function_link.appendChild(cancel_function_link_text); //
preview_para.appendChild(cancel_function_link);

// Put it all toegether
preview_message.appendChild(preview_header);
preview_message.appendChild(preview_para);
main_body.insertBefore(preview_message, main_content);

}
}

function cancel_print_preview() {
// Destroy the preview message
var print_preview = document.getElementById('preview-message');
var main_body = print_preview.parentNode;
main_body.removeChild(print_preview);

// Switch back stylesheet
setActiveStyleSheet('default');
}

function setActiveStyleSheet(title) {
   var i, a, main;
   for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
     if(a.getAttribute("rel").indexOf("style") != -1
        && a.getAttribute("title")) {
       a.disabled = true;
       if(a.getAttribute("title") == title) a.disabled = false;
     }
   }
}