function roundedCorners() {
  var divs = document.getElementsByTagName('div');
  var rounded_divs = [];
  for (var i = 0; i < divs.length; i++) {
    if (/\brounded\b/.exec(divs[i].className)) {
      rounded_divs[rounded_divs.length] = divs[i];
    }
  }
  for (var i = 0; i < rounded_divs.length; i++) {
    var original = rounded_divs[i];
    /* Make it the inner div of the four */
    original.className = original.className.replace('rounded', '');
    /* Now create the outer-most div */
    var tr = document.createElement('div');
    tr.className = 'rounded2';
    /* Swap out the original (we'll put it back later) */
    original.parentNode.replaceChild(tr, original);
    /* Create the two other inner nodes */
    var tl = document.createElement('div');
    var br = document.createElement('div');
    /* Now glue the nodes back in to the document */
    tr.appendChild(tl);
    tl.appendChild(br);
    br.appendChild(original);
  }
}
window.onload = roundedCorners;