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('content');
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('');
		//preview_header.appendChild(preview_header_text);
		
		// Create paragraph
		//var preview_para = document.createElement('p');
		//var preview_para_text = document.createTextNode('');
		
		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 existing page.');
		cancel_function_link.appendChild(cancel_function_link_text)
		//preview_para.appendChild(preview_para_text); //
		//preview_para.appendChild(cancel_function_link);
		preview_header.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;
   var screenStyle = document.getElementsByTagName('style')[0];
   for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
     if (a.getAttribute("rel").indexOf("style") != -1
        && a.getAttribute("title")) {
       		a.disabled = true;
       		screenStyle.media = 'screen';
		if (a.getAttribute("title") == title) {
       		a.disabled = false;
       		screenStyle.media = 'tty';
       	}
     }
   }
}