function ChangeValue(week,current) {
  if (current=='AVAILABLE') {
    document.getElementById('value_'+week).value = 'BOOKED';
    document.getElementById('value_'+week).style.backgroundColor = '#a0b8a6';
    document.getElementById('cell_'+week).style.backgroundColor = '#a0b8a6'
  }
  else {
    document.getElementById('value_'+week).value = 'AVAILABLE';
    document.getElementById('value_'+week).style.backgroundColor = '#FAF7D7';
    document.getElementById('cell_'+week).style.backgroundColor = '#FAF7D7'
  }
}