var ns6 = (!document.all && document.getElementById);
var ie4 = (document.all);

function control_menu(id,mode,hide_select) {
if (id) {
if (mode)  value = 'visible';
if (!mode) value = 'hidden';
if (ns6) {
document.getElementById(id).style.visibility = value;
}
else if(ie4) {
document.all[id].style.visibility = value;
}
if (hide_select && mode)  control_menu(hide_select,0);
if (hide_select && !mode) control_menu(hide_select,1);
}
}


function control_tab(id) {
if (ns6 || ie4) {
// HIDE ALL
control_menu('FLIGHTS-UK',0);
control_menu('FLIGHTS-EUROPE',0);
control_menu('FLIGHTS-WW',0);
control_menu('FLIGHTS-CHEAP',0);
control_menu('AGENTS',0);
control_menu('CARHIRE-EUR',0);
control_menu('CARHIRE-USA',0);
control_menu('CARHIRE-WW',0);
control_menu('FERRIES',0);
control_menu('TRAINS',0);
control_menu('COACHES',0);
control_menu('SHOWALL',0);

// SHOW "id"
control_menu(id,1);
return false;
}
return true;
}