function updateHiddenCheckbox(checkbox, hiddenCheckboxId)
    {
        if (checkbox.checked == true ) 
            {document.getElementById(hiddenCheckboxId).value="yes";}
        else
            {document.getElementById(hiddenCheckboxId).value="no";}
    }
    
    function clearText(textbox)
    {            
        if (textbox.value == "you@domain.com")
        {                             
            textbox.value = '';
        }
    }