function hideAllRoutes() {
 for (i=1; i<=52; i++) if (ul=document.getElementById('taxi_'+i)) ul.style.display = 'none';
 document.getElementById('taxi_show_all_routes').style.display = 'inline';
}

function showAllRoutes() {
 for (i=1; i<=52; i++) if (ul=document.getElementById('taxi_'+i)) ul.style.display = 'block';
 document.getElementById('taxi_show_all_routes').style.display = 'none';
 return false;
}

function showRoute(id) {
 hideAllRoutes();
 document.getElementById('taxi_'+id).style.display = 'block';
}