/* Cookie Management */
function createCookie(name,value,days)
{
	if (days)
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else
		var expires = "";

	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');

	for(var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}

	return null;
}

/* Locate, Clean Up, and Label tabs */
$$('#tabbed_launchpads .heading').each(function(s){
	s.next().addClassName('content');
});

$$('#Launchpad01', '#Launchpad02', '#Launchpad03', '#Launchpad04').each(function(s){
	s.cleanWhitespace();
	if(s.down() == undefined)
		s.remove();
}).compact().each(function(s){
	s.addClassName('primary_launchpad');
});

var tabs = $$('.primary_launchpad');

tabs.last().addClassName('last');
tabs.first().removeClassName('last').addClassName('first');
if(readCookie('tabs'))
{
	$(readCookie('tabs')).addClassName('active');
}
else
{
	$$('#tabbed_launchpads .first').first().addClassName('active');
}

/* Click Event for tabs */
function LaunchpadClick(e)
{
	var launchpad = e.element().up('.primary_launchpad');
	if(!launchpad.hasClassName('active'))
	{
		tabs.each(function(s){
			s.removeClassName('active');
		});
		launchpad.addClassName('active');
		// send event to scrollers to recalculate their appearance
		document.fire("Tab:Switch");
	}
	createCookie('tabs', launchpad.readAttribute('id'));
}

/* Adjust tab height based on # of tabs */
var height = 377 - tabs.size() * 25;
tabs.each(function(s){
	s.down('.content').setStyle({'height': height + 'px'});
	s.down('.heading').observe('click', LaunchpadClick);
});
height = height -7;
tabs.last().down('.content').setStyle({'height': height +'px'});