neither clearTimeout nor ClearInterval is not working

Question

I have problem with setTimeout and clearTimeout.

my flash video player calls "onVideoFinish" function on finish event and calls "cancelVideoFinish" function on replay event.

what I am doing here is creating a playlist. Belove code has setInterval, but I've tried both setTimeout(clearTimeout) and setInterval(clearInterval) and neither of them worked. I also tried defining callback function instead of calling "redirectPage" function.

on console I have somthing like:
---321---
+++null+++

var togoTimer = null;
function onVideoFinish() {
    if ($("#sidePlaylist").length > 0) {
        ...Some Stuff Here...
        if (togo) {
            togoTimer = setInterval("redirectPage('" + togo + "')", 3000);
        }
    }
}

function redirectPage(t) {
    console.log("+++" + togoTimer + "+++");
    window.location = t;
}

function cancelVideoFinish() {
    console.log("---" + togoTimer + "---");
    clearInterval(togoTimer);
    togoTimer = null;
}