var player1data = {
posx: 1,
posy: 2,
posz: 3
rotx: ... etc
}
var player2data = {
posx: 10,
posy: 2,
posz: -23
...etc
}

// an array to store your states
var stateArray = [];
// update endpoint call function
// you send playerId and playerData to the server using url parameters
ccbDoHttpRequest('yourserverhostorip/update?playerId=' + playerId + '&data' + playerData, function(receivedData) {
  // received data from the remote player
  // parse receivedData to js object somehow so you can 
  // access remote player position, rotation and animation
  // parse is just to mock - it's not a real function
  var parsedData = parse(receivedData);
  // save remote player data snapshot time
  parsedData[time] = (new Date()).getTime();
  stateArray.push(parsedData);
})

// this should be run on every frame
// the code sets a position/rotation of the remote player
// get current local time first
var curTime = (new Date()).getTime();
// use an offset to switch it back to around 100/150ms. This is also a common thing google "source multiplayer networking" for example for details.
curTime -= 150;
// find first snapshot which past the curTIme
var firstSnapshot;
// here you look for a first newest snapshot which snaphost.time < curTime
var secondSnapshot;
// you just take a one with (i - 1) from the firstSnapshot;

// you use your lerp function
var player2Posx = lerp(firstSnapshot.x, secondSnapshot.x, curTime - secondSnapshot.time);
// now you apply it to the player