Displaying Hidden Content When Page Loads.

The content of my webpage is all contained in hidden divs. These divs are shown when a link in the nav bar is clicked. At the moment, ALL divs are hidden on page load, only the nav bar is visible. Is there a way to have one of the divs visable when the page loads? i.e the 'home' page.

function init(){
if(document.getElementById && document.createTextNode){
var mn=document.getElementById('nav');
var as=mn.getElementsByTagName('a');
for (var i=0;i<as.length;i++){
as[i]. false}
as[i]. false}
}
hidem();
}}

function show(l){
hidem();
var id=l.href.match(/#(w.+)/)[1];
document.getElementById(id).style.display='block'
}

function hidem(){
for (var i=0;i<document.getElementsByTagName('div').length;i++){
document.getElementsByTagName('div')[i].style.display='none'
}}

The function init() is called on page load.