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;
     }
   }
}

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('page');
var header = document.getElementById('header');
var title = document.getElementById('title');
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 preview of how this page will look when printed.');
        preview_header.appendChild(preview_header_text);

        // Create paragraph
        var preview_para = document.createElement('p');
//        var preview_para_text = document.createTextNode ('Without this message of course. ');

        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('Close preview and return to page.');
        cancel_function_link.appendChild (cancel_function_link_text);
//        preview_para.appendChild(preview_para_text); //
        preview_para.appendChild(cancel_function_link);

		var print_logo = document.createElement('img');
		print_logo.id = 'print-logo';
		print_logo.setAttribute('src', '/images/layout/header-title-print.png');

        // Put it all together
        preview_message.appendChild(preview_header); 
        preview_message.appendChild(preview_para);
        main_body.insertBefore(preview_message, main_content);
        header.insertBefore(print_logo, title);
    }
}

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

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