ns4 = (document.layers) ? true:false //required for Functions to work
ie4 = (document.all) ? true:false //required for Functions to work
ng5 = (document.getElementById) ? true:false //required for Functions to work

function showSec(n) {
if (ng5) document.getElementById('sec' + n).style.visibility = "visible";
else if (ns4) document.layers["sec" + n].visibility = "show";
else if (ie4) document.all["sec" + n].style.visibility = "visible";
}

function hideSec(n) {
if (ng5) document.getElementById('sec' + n).style.visibility = "hidden";
else if (ns4) document.layers["sec" + n].visibility = "hide";
else if (ie4) document.all["sec" + n].style.visibility = "hidden";
}