function roundedCorners(objLayer) {
  var divs = document.getElementsByTagName('div');
  var rounded_divs = [];
  for (var i = 0; i < divs.length; i++) {
    if (divs[i].className == objLayer) {
      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 = 'callout';
   /* 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); 
  }
}