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

function addResizeEvent(func) {
  var oldonresize = window.onresize;
  if (typeof window.onresize != 'function') {
    window.onresize = func;
  }
  else {
    window.onResize = function() {
        oldonresize();
      func();
    }
  }
}