How to I make sure my time has AM or PM time?

window.onload = startTime;

function startTime() {

var today = new Date();

var h = today.getHours() % 12 || 12;

var m = today.getMinutes();

var s = today.getSeconds();

m = checkTime(m);

s = checkTime(s);

document.getElementById('txt').innerHTML =

h + ":" + m + ":" + s;

var t = setTimeout(startTime, 500);

}

function checkTime(i) {

if (i < 10) {i = "0" + i}; // add zero in front of numbers < 10

return i;

}

document.write(hours + ":" + minutes + " " + suffix)