var NFOLDS = 2;
var currentTab = 0;

function setDefaultTab(sel)
{
	document.cookie = 'currenttab=' + sel + ';path=/';
}

function getDefaultTab()
{
	var s = document.cookie;
	var idx = s.indexOf('currenttab=');
	if (idx == -1)
		return 1;
	else
	{
		var i = parseInt(s.substring(idx+11, idx+12));
		if (i <= 0 || i > NFOLDS || isNaN(i))
			i = 1;
		return i;
	}
}

function switchtab(sel)
{
	if (currentTab != sel)
	{
		setDefaultTab(sel);
		for (var i = 1; i <= NFOLDS; i++)
			document.getElementById("tab" + i).className = "tab sw"+sel;
	}
}

function inittabs()
{
	document.getElementById('tt1').onclick = function() { switchtab(1); };
	document.getElementById('tt2').onclick = function() { switchtab(2); };
	switchtab(getDefaultTab());
}

window.onload = function() { inittabs(); };