function ValidateGiftCard(id) {
  var valid = true;
  
  //alert("validate "+id);
  
  if (valid) {
    //disable fields
    document.getElementById('inputGiftCardNumber'+id).disabled = "disabled";
    document.getElementById('inputGiftCardCVC'+id).disabled = "disabled";
    document.getElementById('inputGiftCardAmount'+id).disabled = "disabled";
  
    //hide validate link
    document.getElementById('ValidateGiftCard'+id).style.display = 'none';
    document.getElementById('displayValidate'+id).value = 'none';
    
    //display clear link
    document.getElementById('ClearGiftCard'+id).style.display = 'inline-block';
    document.getElementById('displayClear'+id).value = 'inline-block';
  }

  return true;
}   

function ClearGiftCard(id) {
  //alert("clear "+id);
  
  //enable the fields
  document.getElementById('inputGiftCardNumber'+id).disabled = "";
  document.getElementById('inputGiftCardCVC'+id).disabled = "";
  document.getElementById('inputGiftCardAmount'+id).disabled = "";
  
  //clear field values
  document.getElementById('inputGiftCardNumber'+id).value = "";
  document.getElementById('inputGiftCardCVC'+id).value = "";
  document.getElementById('inputGiftCardAmount'+id).value = "";
  
  //display validate link
  document.getElementById('ValidateGiftCard'+id).style.display = 'inline-block';
  document.getElementById('displayValidate'+id).value = 'inline-block';
  
  //hide clear link
  document.getElementById('ClearGiftCard'+id).style.display = 'none';
  document.getElementById('displayClear'+id).value = 'none';
}  

function AddGiftCard(id) {
  document.getElementById('GiftCard'+id).style.display='block';
  document.getElementById('displayCard'+id).value='block';
  
  document.getElementById('AddGiftCard'+parseInt(id-1)).style.display='none';  
  document.getElementById('displayAdd'+parseInt(id-1)).value='none';
  
  if (id > 2) { 
    document.getElementById('RemoveGiftCard'+parseInt(id-1)).style.display='none';
    document.getElementById('displayRemove'+parseInt(id-1)).value='none';
  }
}

function RemoveGiftCard(id) {
  document.getElementById('inputGiftCardNumber'+id).value = "";
  document.getElementById('inputGiftCardCVC'+id).value = "";
  document.getElementById('inputGiftCardAmount'+id).value = "";
  
  document.getElementById('GiftCard'+id).style.display='none';
  document.getElementById('displayCard'+id).value='none';
  
  document.getElementById('AddGiftCard'+parseInt(id-1)).style.display='inline-block';
  document.getElementById('displayAdd'+parseInt(id-1)).value='inline-block';
  
  if (id > 2) { 
    document.getElementById('RemoveGiftCard'+parseInt(id-1)).style.display='inline-block';  
    document.getElementById('displayRemove'+parseInt(id-1)).value='inline-block';
  }
}