Simple navigation tree:
function toggle(item) {
obj=document.getElementById(item);
if(obj) {
visible=(obj.style.display!="none")
key=document.getElementById("x" + item);
if (visible) {
obj.style.display="none";
//key.innerHTML="";
} else {
obj.style.display="block";
/ key.innerHTML="";
} // if
} // if
} // toggle
function expand() {
divs=document.getElementsByTagName("DIV");
for (i=0;i divs[i].style.display="block";
key=document.getElementById("x" + divs[i].id);
//key.innerHTML="";
} // for
} // expand
function collapse() {
divs=document.getElementsByTagName("DIV");
for (i=0;i divs[i].style.display="none";
key=document.getElementById("x" + divs[i].id);
//key.innerHTML="";
} // for
} // toggle
