Javascript circle var

<script src="http://koda.nu/simple.js">

  var x = 50;
  var storlek = 80;

  circle(100 + x, 150, storlek, "red");
  circle(100 + 2 * x, 150, storlek, "green");
  circle(100 + 3 * x, 150, storlek, "blue");

</script>