function addLoadEvent(func,oObj) {
  if (!oObj)
  	oObj = window;
  var oldonload = oObj.onload;
  if (typeof oObj.onload != 'function') {
    oObj.onload = func;
  } else {
    oObj.onload = function() {
      oldonload();
      func();
    }
  }
}