function navega(ruta)
{
var LA_URL = window.location.href;
//var RAIZ = LA_URL.substring(0,LA_URL.lastIndexOf('/')+1); 
//var RAIZ = "http://192.168.155.91/php/php_gra/teenvio/";
//var RAIZ = "http://teenvio.com/teenvio/";
var RAIZ = "http://www.teenvio.com/";
window.location.href=RAIZ+ruta;
}