// JavaScript Document
function changeTab(index)
{
	for (var i=1;i<=3;i++)
	{
		document.getElementById ("li_"+i).className ="normal";
		document.getElementById ("li_"+index).className ="selected";
		
		document.getElementById ("div"+i).style.display  ="none";
	}
	
	document.getElementById ("div"+index).style.display  ="block";
}