JavaScript timer play/pause in one button

My goal is merge play and stop buttons to one. Buttons start/stop/reset timer.

$(".start").click(function(){ 
        $(".silent_lesson").TimeCircles().start(); 
        $("#ding-audio").trigger("play");
}); 
     $(".stop").click(function(){ $(".silent_lesson").TimeCircles().stop(); $(".stopwatch_value").html(" +"+Math.abs(Math.round($(".silent_lesson").TimeCircles().getTime()))+" seconds")}); 
     $(".restart").click(function(){ $(".silent_lesson").TimeCircles().restart(); $(".stop").trigger("click"); }); 

any ideas ?