function showdate() { 

document.getElementById('ThisDates').style.display= 'none';
document.getElementById('ThisDatesTitle').style.display= 'none';
document.getElementById('NextDates').style.display= 'block'; 
document.getElementById('NextDatesTitle').style.display= 'block';
} 

function hidedate() { 

document.getElementById('ThisDates').style.display= 'block';
document.getElementById('ThisDatesTitle').style.display= 'block';
document.getElementById('NextDates').style.display= 'none'; 
document.getElementById('NextDatesTitle').style.display= 'none';
}