Create a loop for a javascript code [closed]

Answer 1

Not sure what you are asking, but may I suggest something a little tidier?

function fade(n, el) {
  el.style.opacity = n;
  n = n - 0.1;
  if (n.toFixed(1) > 0) {setTimeout(function() {fade(n, el);},100);}
  else {setTimeout(function() {hide(el);}, 100);}
}

function hide(el) {
  el.style.visibility='hidden';
}

and then initially call

fade(0.9, document.getElementById("myDiv"));

eg: http://jsfiddle.net/XY4yM/