Javascript clearTimeout Not Working Properly

I have written this function which calls a .net method if there is no user activity on the page for sometime.

function IdleSessionLogout(dotnetHelper) {
    var timer;
    document.onmousemove = resetTimer;
    document.onkeypress = resetTimer;

    function resetTimer() {
        console.log("I am in Reset Timer Function");
        clearTimeout(timer);
        timer = setTimeout(Logout, 5000);
    }
    function Logout() {

        dotnetHelper.invokeMethodAsync("Logout");
    }
}

I have checked function is triggered but the clearTimeout does not work and user is still logged out even there is some activity from user. Can please tell me what I am doing wrong here?

>Solution :

I created the timeout outside of the reset timer, if the user moves the mouse clearTimeout will invoke and log out operation will cancel. Try this;

function IdleSessionLogout(dotnetHelper) {
    var timer = setTimeout(Logout, 5000); 
    document.onmousemove = resetTimer;
    document.onkeypress = resetTimer;

    function resetTimer() {
        console.log("I am in Reset Timer Function");
        clearTimeout(timer);
    }
    function Logout() {
        dotnetHelper.invokeMethodAsync("Logout");
    }
}