var arrayImages = new Array();
arrayImages['andalucia'] = new Image (260,20);
arrayImages['andalucia'].src = "imagenes/emailandalucia.jpg";
arrayImages['cantabria'] = new Image (260,20);
arrayImages['cantabria'].src = "imagenes/emailcantabria.jpg";
arrayImages['catalunya'] = new Image (260,20);
arrayImages['catalunya'].src = "imagenes/emailcatalunya.jpg";
arrayImages['central'] = new Image (260,20);
arrayImages['central'].src = "imagenes/email.jpg";
arrayImages['galicia'] = new Image (260,20);
arrayImages['galicia'].src = "imagenes/emailgalicia.jpg";
arrayImages['pais_vasco'] = new Image (260,20);
arrayImages['pais_vasco'].src = "imagenes/emailpaisvasco.jpg";
arrayImages['madrid'] = new Image (260,20);
arrayImages['madrid'].src = "imagenes/emailmadrid.jpg";

function switchmail(reg)
{
document.images["mail"].src = arrayImages[reg].src;	
}