Different ways to modify the DOM

1. document.getElementById("gp_pTime").innerHTM="?"

2. gp_pTime.textContent="?"

3. var elment = document.getElementById("gp_pTime");

elment.textContent = "?";

4. var elment = document.getElementById("gp_pTime");

document.getElementById(element).innerHTM="?"

See stackoverflow  for more information.

Pros &cons

1. the id ("gp_pTime") can be replaced by a variable

2. the id ("gp_pTime') can't be replaced by a variable

3. the id ("gp_pTime") can be replaced by a variable

4. the id ("gp_pTime") can be replaced by a variable