function show(divid) {
   if (document.layers) document.layers[divid].visibility="show";
   else document.getElementById(divid).style.display="block";
   document.getElementById(divid + '_tab').className = 'active';
}

function hide(divid) {
   if (document.layers) document.layers[divid].visibility="hide";
   else document.getElementById(divid).style.display="none";
   document.getElementById(divid + '_tab').className = '';
}