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();

}

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('h13');
        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('Sin el mensaje.');
        var preview_para_text2 = document.createTextNode('  /  ')
        //cancelar vista preview
        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('Regresar a la vista normal');
        cancel_function_link.appendChild(cancel_function_link_text);
   
        // Create hr
        var preview_separa = document.createElement('hr');
   
        //Boton para imprimir   
   
        var print_function_link = document.createElement('a');
            print_function_link.onclick = function(){ imprimir_nota(); return false; };
            print_function_link.setAttribute('href', '#');   
        var print_function_link_text = document.createTextNode('Imprimir.');
        print_function_link.appendChild(print_function_link_text);

        //preview_para.appendChild(cancel_function_link);
       
        var imagen_header= document.createElement('img');
        imagen_header.setAttribute('src', 'http://i2.esmas.com/deportes30/img/TD_PRINT.gif');   
        preview_header.appendChild(imagen_header);
        preview_para.appendChild(cancel_function_link);
        preview_para.appendChild(preview_para_text2);
        preview_para.appendChild(print_function_link);
        // Put it all toegether
        preview_message.appendChild(preview_header);
        preview_message.appendChild(preview_para);
        preview_message.appendChild(preview_separa);
        main_body.insertBefore(preview_message, main_content);
       
       
        //*****************************************************************pruebas
       
        var preview_message2 = document.createElement('div');
        preview_message2.id = 'preview-message2';
   
       
        var preview_header2 = document.createElement('h13');

   
        var preview_para2 = document.createElement('p');
       
        var preview_para2_text2 = document.createTextNode('ESMAS y el logotipo de ESMAS son marcas registradas. Derechos Reservados © Comercio Mas, S.A. de C.V. 2004.')
        var preview_separa2 = document.createElement('hr');
        var imagen_header2= document.createElement('img');
        imagen_header2.setAttribute('src', 'http://i2.esmas.com/deportes30/img/TD_PRINT.gif');   
        //preview_para2.appendChild(imagen_header2);
        preview_message2.appendChild(preview_separa2);
        preview_message2.appendChild(preview_header2);
        preview_message2.appendChild(preview_para2);
        preview_para2.appendChild(preview_para2_text2);
        main_body.parentNode.insertBefore(preview_message2, main_body.nextSibling);
       
        //*****************************************************************fin pruebas
    }
}

function imprimir_nota()
{
    window.print();
}

function cancel_print_preview() {
    // Destroy the preview message
    var print_preview = document.getElementById('preview-message');
    var print_preview2 = document.getElementById('preview-message2');
    var main_body = print_preview.parentNode;
   
    main_body.removeChild(print_preview);
   
    var main_body2 = print_preview2.parentNode;
    main_body2.removeChild(print_preview2);
    setActiveStyleSheet('minibar');
   
}

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;
     }
   }
}