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 = 'tab0' + (num + 1);
			}
			else{
				pages[i].style.display = 'none';
				tabs[i].className = null;
			}
		}
	}
}

function tabIni () {
	tab.setup = {
		tabs: document.getElementById('tab').getElementsByTagName('li'),
		
		pages: [
			document.getElementById('main01'),
			document.getElementById('main02')
		]
	}
	tab.init();
}

if(window.addEventListener) {
	window.addEventListener("load", tabIni, false);
}else if(window.attachEvent) {
	window.attachEvent("onload", tabIni);
}