if (navigator.appName == 'Netscape') 
var language = navigator.language; 
else 
var language = navigator.browserLanguage;

// alert (language);

if (language.indexOf('es') > -1) document.location.href = 'es/index.htm'; 
else if (language.indexOf('eu') > -1) document.location.href = 'eu/index.htm'; 
else 
document.location.href = 'en/index.htm';