function check_form() {
    if (validate_fields()) {
        document.CntForm.submit()
    }
}
function validate_fields(){
        if (document.CntForm.cname.value == "") {
            alert("Please enter a value for the \"Name\" field.");
            document.CntForm.cname.focus();
            return (false);
        }

        if (document.CntForm.email.value == "") {
            alert("Please enter a value for the \"Email\" field.");
            document.CntForm.email.focus();
            return (false);
        }

        if (document.CntForm.email.value != "") {
            if (!(isEmail(document.CntForm.email.value))) {
                alert("Please enter a valid Email address.");
                document.CntForm.email.focus();
                return (false);
            }
        }
        if (document.CntForm.msg.value == "") {
            alert("Please enter a value for the \"Message\" field.");
            document.CntForm.msg.focus();
            return (false);
        }
        return (true);
    }
function isEmail(inputVal) {
        var inputStr = inputVal.toString()
        var foundat = false
        var founddot = false
        for (var i = 0; i < inputStr.length; i++) {
            var oneChar = inputStr.charAt(i)
            if (oneChar == "@") {
                foundat = true
            }
            if (oneChar == ".") {
                founddot = true
            }
        }
        if (foundat && founddot) {
            return true
        }
        return false
    }