// JavaScript Document

var num = 2; // this is # of divs you have
function swap(what)
{
for(var i = 0; i < num; i++)
{
document.getElementById('about-us'+i).style.display = 'none';
}
document.getElementById('about-us'+what).style.display = 'block';
}
var createStyle = document.createElement('style');
var createStyleProp = document.createTextNode('.hidden { display:none; }');
createStyle.appendChild(createStyleProp);
document.getElementsByTagName('head')[0].appendChild(createStyle);