How to interrupt a timeout

interrupt.js

var pollInterval = 10000,
    pollTimeout = null;

function pollSpots() {
    printDXSpots();
    pollTimeout = window.setTimeout(pollSpots, pollInterval);
}

// ... later ...

function forcePollSpots() {
    if (pollTimeout) {
        window.clearTimeout(pollTimeout);
    }
    printDXSpots();
    pollTimeout = window.setTimeout(pollSpots, pollInterval);
}