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/noticieros3/img/logo_esmas_footer.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/noticieros3/img/logo_esmas_footer.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;
     }
   }
}