function go(topic){
  if (topic!=act_topic || topic=="news"){
    old_topic = act_topic;
    act_topic = topic;
    rollover_old = "ro"+old_topic;
    hide(rollover_old);
    hide(old_topic);
    location.href = "/html/"+act_topic+".php";
  }
}

function hiliteMe(topic){
show("ro"+topic);
show(topic);
}