Proper JavaScript Window Management?

[Kingz V]

Let's say you have a script.

for example

// ==/UserScript==
clix();
function clix() {
  //generate random number
  x = getRandomInt(1, 20)
  y = getRandomInt(1, 28);
  clixdo(x, y);
}
function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

Where clixdo is javascript for window.open( url + x + y )

How would you go about managing the windows, and properly closing them?

What about with a given time interval. (page needs to load another page and wait x time)

Given the code could be changed to new_window = window.open( some url ) and could be added to an array.