function previous_week()
{
	var week_one = document.getElementById('week_one').style.visibility;
	var week_two = document.getElementById('week_two').style.visibility;
	var week_three = document.getElementById('week_three').style.visibility;

	if (week_one == 'hidden' && week_two == 'visible' || week_two == '')		
	{
		document.getElementById('week_one').style.visibility = 'visible';
		document.getElementById('week_two').style.visibility = 'hidden';		
		document.getElementById('weeks_events').innerHTML = 'Last Weeks Events';
	}
	else if (week_three == 'visible' || week_three == '' && week_two == 'hidden')		
	{		
		document.getElementById('week_two').style.visibility = 'visible';
		document.getElementById('week_three').style.visibility = 'hidden';
		document.getElementById('weeks_events').innerHTML = 'This Weeks Events';
	}
}

function next_week()
{
	var week_one = document.getElementById('week_one').style.visibility;
	var week_two = document.getElementById('week_two').style.visibility;
	var week_three = document.getElementById('week_three').style.visibility;

	if (week_one == 'visible' || week_one == '' && week_two == 'hidden')		
	{
		document.getElementById('week_one').style.visibility = 'hidden';
		document.getElementById('week_two').style.visibility = 'visible';	
		document.getElementById('weeks_events').innerHTML = 'This Weeks Events';
	}
	else if (week_three == 'hidden' && week_two == 'visible' || week_two == '')		
	{		
		document.getElementById('week_two').style.visibility = 'hidden';
		document.getElementById('week_three').style.visibility = 'visible';
		document.getElementById('weeks_events').innerHTML = 'Next Weeks Events';
	}	
}