function onClick_Login()
{
	var login = document.getElementById('login');
    var login_opacity = document.getElementById('login_opacity');
    if(login.style.visibility == 'visible')
    {
        login_opacity.style.visibility = 'hidden';        
        login.style.visibility = 'hidden';
    }
    else
    {
        login_opacity.style.visibility = 'visible';  
        login.style.visibility = 'visible';
    }
}

function setBackgroundCalendarHeight(height)
{
    var bg = document.getElementById('calendar');
    bg.style.height = height + 'px';
}