img_off_1 = new Image();
img_off_1.src = ROOT_DIR+"imagenes/"+ROOT_LANG+"/hover/buscar.gif"
img_on_1 = new Image();
img_on_1.src = ROOT_DIR+"imagenes/"+ROOT_LANG+"/buscar.gif"

img_off_2 = new Image();
img_off_2.src = ROOT_DIR+"imagenes/"+ROOT_LANG+"/hover/entrar.gif"
img_on_2 = new Image();
img_on_2.src = ROOT_DIR+"imagenes/"+ROOT_LANG+"/entrar.gif"

img_off_3 = new Image();
img_off_3.src = ROOT_DIR+"imagenes/"+ROOT_LANG+"/hover/enviar.gif"
img_on_3 = new Image();
img_on_3.src = ROOT_DIR+"imagenes/"+ROOT_LANG+"/enviar.gif"

img_off_4 = new Image();
img_off_4.src = ROOT_DIR+"imagenes/"+ROOT_LANG+"/hover/enviar_mail.gif"
img_on_4 = new Image();
img_on_4.src = ROOT_DIR+"imagenes/"+ROOT_LANG+"/enviar_mail.gif"