function valiDate()
{
        if (document.unsub.em.value.indexOf("@") == -1 ||
            document.unsub.em.value.indexOf(".") == -1 ||
            document.unsub.em.value == "") {
                alert("Please include a proper email address.");
                return false;

        }
}

function CheckMate2() {
        var theform = this.document.forms.unsub;
        for (i=0,n=theform.elements.length;i<n;i++) {
                if (theform.elements[i].checked == false) {
                        theform.elements[i].checked = true;
                } else {
                        theform.elements[i].checked = false;
                }
        }
}