function ValidateData() {
    var CanSubmit = false;

    // Check to make sure that the full name field is not empty.
        CanSubmit = ForceEntry(document.forms[0].zipcode,"You must supply a zipcode.");

    // Check to make sure the zipcode entered is actually a zip code
    if (CanSubmit)
        CanSubmit = isZipcode(document.forms[0].zipcode.value,"You must enter a valid zipcode.");

    // Lets make sure our age and disability buttons are checked
    if (CanSubmit)
        CanSubmit = checkRadio(document.forms[0].agebutton,"You must select an age group.");

    if (CanSubmit)
        CanSubmit = checkRadio(document.forms[0].disabilitybutton,"You must select a disability group.");

    return CanSubmit;
}