var tabList;
var btnList;

function setTabs() {

	tabList = new Array(
		document.getElementById("tab0"), 
		document.getElementById("tab1"), 
		document.getElementById("tab2"));
		
	btnList = new Array(
		document.getElementById("btn0"), 
		document.getElementById("btn1"), 
		document.getElementById("btn2"));
		
	showTab(0);
}

function showTab(tabID) {
	for (var i = 0; i < 3; i++) {
		tabList[i].style.display = 'none';
		btnList[i].className = '';
	}
	
	tabList[tabID].style.display = 'inline';
	btnList[tabID].className = 'selected';
}

window.onload = setTabs;