function hasCtls(O) {
  if (!O.getElementsByTagName) return 1;
  var A=O.getElementsByTagName('*'); 

  var ret=(O.tagName=='INPUT' || O.tagName=='TEXTAREA' || O.tagName=='SELECT');
  for (var i in A) if (i!='toJSONString') 
    if (A[i].tagName=='INPUT' || A[i].tagName=='TEXTAREA' || A[i].tagName=='SELECT')
      ret=1;
  return ret;
}

window.onload=function() {
  var A=document.getElementsByTagName('*');
  var ok=1;
  for (var i in A) if (i!='toJSONString') 
    if (!hasCtls(A[i])) A[i].onselectstart = A[i].onmousedown = function() {return false;}

}