var tab = {
init: function(){

var tabs = this.setup.tabs;
var pages = this.setup.pages;

for(i=0; i<pages.length; i++) {
if(i !== 0) pages[i].style.display = 'none';
tabs[i].onclick = function(){ tab.showpage(this); return false; };
}
},

showpage: function(obj){
var tabs = this.setup.tabs;
var pages = this.setup.pages;
var num;

for(num=0; num<tabs.length; num++) {
if(tabs[num] === obj) break;
}

for(var i=0; i<pages.length; i++) {
if(i == num) {
pages[num].style.display = 'block';
tabs[num].className = 'present';
}
else{
pages[i].style.display = 'none';
tabs[i].className = null;
}
}
}
}