var avisPreferredTCCheckBoxClientID

function OnTermsAndConditionsControlLoad(AvisPreferredTCCheckBoxClientID)
{
    avisPreferredTCCheckBoxClientID = AvisPreferredTCCheckBoxClientID;
}

function ValidateTandCs(source, args)
{
    args.IsValid = document.getElementById(avisPreferredTCCheckBoxClientID).checked;
}