function showDiv(divId) {
    if ( divId != "" ) {
	var re = new RegExp("^sub");
        navi=divId.replace(re,"");
	subnavi="sub"+navi;
        document.getElementById(subnavi).style.visibility = "visible";
    }
}
function hideDiv(divId) {
    if ( divId != "" ) {
	var re = new RegExp("^sub");
    
	navi=divId.replace(re,"");
	subnavi="sub"+navi;
	document.getElementById(subnavi).style.visibility = "hidden";
    }
}

<!--
nav = new Array("nav0","nav1","nav2","nav3","nav4","nav5","nav6","nav7","nav8");
content = new Array("subbox00","subbox01","subbox02","subbox03","subbox04","subbox05","subbox06","subbox07","subbox08");
var active = "";
function menue(active,number) {
for (var i=0; i < nav.length; ++i){
var nodeObj = nav[i]; 
var nodeHide = content[i];
document.getElementById(nodeHide).style.display = "none";
}
var nodeShow = content[number];
document.getElementById(nodeShow).style.display = "block";
}
//-->