var cencal=true;
    function sp() {  // set price and store
        document.getElementById("vduesbiz").value    = "vdmpay@vdmdiveclub.org" ;
        document.getElementById("vduesscbiz").value  = "vdmpay@vdmdiveclub.org" ;

        document.getElementById("vduesamt").value  = "41.20" ;
        document.getElementById("vdueshand").value =  "0.30" ;

        document.getElementById("vduesbut").disabled = false ;
        document.getElementById("vduesscbut").disabled = false ;
    }
    function toggleCencal() {
        cencal = !cencal ;
        if (cencal) {
            document.getElementById("vduesos1").value = "CenCal Member" ;
        }
        else {
            document.getElementById("vduesos1").value = "NO-CenCal ***" ;
        }
    }