helpers.js

function addLoadEvent(func) {

  var oldonload = window.onload;

  if (typeof window.onload != 'function') {

    window.onload = func;

  } else {

    window.onload = function () {

      oldonload();

      func();

    }

  }

}


function addEvent(elm, evType, fn, useCapture) {

  if (elm.addEventListener) {

    elm.addEventListener(evType, fn, useCapture);

    return true;

  } else if (elm.attachEvent) {

    var r = elm.attachEvent('on' + evType, fn);

    return r;

  } else {

    elm['on' + evType] = fn;

  }

}