Resize, element html, pure javascript.

resize.js

var object = undefined
  , minimum = undefined
  , count = 0
  , limit = 0
  , skip = 5
  , interval = undefined;

function expand(width) {
  object = document.getElementById('super');
  minimum = object.offsetWidth;
  limit = width;
  stop();
  interval = setInterval('toggle()', 0.1);
  if (count == 0 ) { count += minimum };
}

function toggle() {
  if (limit > minimum){
    increment()
  } else{
    decrement()
  }

  document.getElementById('super_expand').style.width = count + "px";
  object.style.width = count + "px";
}

function increment(){
  if (limit > count){
    count += skip;
  } else{
    stop();
  }
}

function decrement(){
  if (limit < count){
    count -= skip;
  } else{
    stop();
  }
}

function stop() {
  clearInterval(interval);
}