var JS = {
  start: function(){
	
	$('cbsexos').addEvent('change', function() {
    cat=$('cbsexos').value;
    svcUrl="http://www.naturals-products.com/svc/cargar-tallas/" + cat;
      
    var req = new Request.HTML({url:svcUrl, 
    
    onSuccess: function(html) {
        //Clear the text currently inside the results div.
        $('np_tallas').set('text', '');
        //Inject the new DOM elements into the results div.
        $('np_tallas').adopt(html);
        $('np_tallas').style.display="inline";
               
      }
    });
  
    req.send();
	});
  

  }
}
window.addEvent('load', JS.start);