gistfile1.js

// standard time - remember, time 1 second --> 1000
var time = 2000;

// our function to load the map
function loadMap(newTime) {
  if(newTime == 4000) {
    time = 2000;
  }
  $("#r3").load('response.php');
  window.setTimeout("loadMap("+time+");", time);
}

// onclick we reduce the time
$('#link').click(function() {
  time = 4000;
});

// now after document was loaded start the load
$(document).ready(function() {
  loadMap(time);
});