// Copyright by Leon Winter
function cat(x, y) {
parent.nav_left.location.href=y+"/nav_left.html";
parent.main.location.href=y+"/index.html";
act(x);
}
function act(z) {
for (i=0; i<document.getElementsByTagName("a").length; i++) {
document.getElementsByTagName("a")[i].className="";
}
document.getElementsByTagName("a")[z].className="act";
}