call a function inside innerHTML does not work

I need to call a function inside innerHTML and this is my try but it doesn't work.

    var myname;
function validate (){
    // const mess = document.getElementById("message");
    // mess.innerHTML = "";
    var myname = document.myform.email.value;
    if (myname == ""){
        alert("Please provide Gmail Address");
        return false;
    }
    else{
        // mess.innerHTML("Sucessfully");
        document.getElementById("message").innerHTML="Sucessfully";
    }
}