function init() {
// this code to make it work in most browsers
// makes a list of every div tag in the page
 if (document.getElementById) {
  var x = document.getElementsByTagName('div');
 } else if (document.all) {
  var x = document.all.tags('div');
 } else {
  return;
 }
// this code to make the rollover
// it will take any div whose class is 'inactivo' and replace it to 'activo'
// when moving your mouse over it
// the inverse effect will occur when moving your mouse outside
 for (var i=0;i<x.length;i++) {
  x[i].onmouseover = function () { if (this.className == 'rbroundbox')
this.className = 'rbroundbox2'; }
  x[i].onmouseout = function () { if (this.className == 'rbroundbox2')
this.className = 'rbroundbox'; }
 }
}