I'm trying to implement a timer which does a countdown from 60 seconds. I am able to pause the timer when I click the pause button, but when I click it again to resume, it resets the timer back to 60 seconds.

Here's a snippet of the code:

```
var t = 0;

function pause_game(pause_button){
    var elem = document.getElementById('pause_button');
    var lastTime;
    if (elem.value=="PAUSE"){
        lastTime = clearTimeout(t);
        elem.value = "RESUME";
    }
    if (elem.value=="RESUME"){
        countdownTimer(lastTime);
        elem.value = "PAUSE";
    }
}

function countdownTimer(secs) {
    var game_page = document.getElementById('game_page');
    var start_page = document.getElementById('start_page');
    var seconds = 60;
    function tick() {
        var counter = document.getElementById("timer");
        seconds--;
        counter.innerHTML = "0" + ":" + (seconds < 10 ? "0" : "") + String(seconds);
        if(seconds > 0) {
            t = setTimeout(tick, 1000);
        }
        else {
            setTimeout(function () {
            game_page.style.display = 'none';
            start_page.style.display = 'block';
            }, 1000)
        }
    tick();
}

```

Can't seem to figure out what went wrong. Help would be greatly appreciated. Thanks!