function GetCancellationReason()
{
    var reason = prompt("Enter a cancellation reason (Max 255 characters):","");
    
    if(reason==null || reason.length == 0)
    {
        alert("Cancellation reason must be entered.");
        return false;
    }
    
    if(reason.length > 255)
    {
        alert("Cancellation reason must be less than 255 chars.");
        return false;
    }
    
    var textBox = document.getElementById(hiddenInputID);
    
    textBox.value = reason;
        
    return true;   
}