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

function debug(str){
    try{
        //debug_el = document.getElementById('debug');
        //debug_el.innerHTML = str + '<br />' + debug_el.innerHTML;
    }catch(e){
        // alert(e + ' --  please create a html element with id debug');
    }
}