Array.prototype.in_array=function(){
	for(var j in this){
		if(this[j]==arguments[0]){
			return true;
		}
	}
	return false;    
}

function idioma(id){
	var idiomas=["es","en"];
	if(idiomas.in_array(id)){
		var hoy = new Date();
		var expiracion = new Date();
			expiracion.setTime(hoy.getTime() + 3600000*8760);
			document.cookie = "idioma="+id+";expires="+expiracion.toGMTString();
			window.location="index.php";
	}
}