function removeString(s, t) {

  i = s.indexOf(t);
  r = "";
  if (i == -1) return s;
  r += s.substring(0,i) + removeString(s.substring(i + t.length), t);
  return r;
  }

function AlternarImagen(img) {
	var searchString = '_ON';
	var imgSrc = img.src.toUpperCase();
	var index = imgSrc.indexOf(searchString);

	if ( index > 0 ) {
      img.src = removeString(imgSrc, searchString);

      //img.src = imgSrc.substring(0,imgSrc.indexOf(searchString)) + remove(imgSrc.substring(i + searchString.length), searchString);
	} else {

	  var ext = imgSrc.substring(imgSrc.length-4, imgSrc.length );

      var leading = imgSrc.substring(0, imgSrc.length-4);

      var trailing = imgSrc.substring(imgSrc.length-4, imgSrc.length);

	  img.src = leading + searchString + trailing;
	}
}


var menuItems =
[

['<img src=/images/btn-contactenos.gif border="0" onmouseover="AlternarImagen(this)" onmouseout="AlternarImagen(this)" alt="Cont&aacute;ctenos" />',"/contactenos.html","","","","_self","0", , , , , ],
['<img src=/images/btn-opina.gif border="0" onmouseover="AlternarImagen(this)" onmouseout="AlternarImagen(this)" alt="Usted&nbsp;opina" />',"/Usted Opina.html","","","","_self","0", , , , , ],
['<img src=/images/separador-00.gif border="0" onmouseover="AlternarImagen(this)" onmouseout="AlternarImagen(this)" alt="-----------SEPARADOR------------" />',"","","","","_self","0", , , , , ],
['<img src=/images/btn-bibliotecas.gif border="0" onmouseover="AlternarImagen(this)" onmouseout="AlternarImagen(this)" alt="Bibliotecas&nbsp;SINABI" />',"/biblioteca sinabi","","","","_self","0", , , , , ],
['<img src=/images/btn-actividades.gif border="0" onmouseover="AlternarImagen(this)" onmouseout="AlternarImagen(this)" alt="actividades" />',"http://www.sinabi.go.cr/portal/consultaactividades.aspx","","","","_self","0", , , , , ],
['<img src=/images/btn-noticias.gif border="0" onmouseover="AlternarImagen(this)" onmouseout="AlternarImagen(this)" alt="Noticias" />',"/Noticias/noticias.html","","","","_self","0", , , , , ],
['<img src=/images/separador-00.gif border="0" onmouseover="AlternarImagen(this)" onmouseout="AlternarImagen(this)" alt="--------------SEPARADOR---------------" />',"","","","","_self","0", , , , , ],
['<img src=/images/btn-sitiosInteres.gif border="0" onmouseover="AlternarImagen(this)" onmouseout="AlternarImagen(this)" alt="Sitios&nbsp;de&nbsp;Inter&eacute;s" />',"/Sitios de Interes","","","","_self","0", , , , , ],
['<img src=/images/btn-diccionario.gif border="0" onmouseover="AlternarImagen(this)" onmouseout="AlternarImagen(this)" alt="Diccionario&nbsp;biogr&aacute;fico" />',"/diccionarioBiografico/index.html","","","","_self","0", , , , , ],
['<img src=/images/btn-cronologia.gif border="0" onmouseover="AlternarImagen(this)" onmouseout="AlternarImagen(this)" alt="cronologia" />',"/Historia de la Biblioteca Nacional","","","","_self","0", , , , , ],
['<img src=/images/btn-exhibicion.gif border="0" onmouseover="AlternarImagen(this)" onmouseout="AlternarImagen(this)" alt="EXHIBICION&nbsp;VIRTUAL" />',"/Tesoros de la Biblioteca Nacional/index.html","","","","_self","0", , , , , ],


];