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    function urlParam(name){
        var results = new RegExp("[\\?&]" + name + "=([^&#]*)").exec(window.location.href);
        if(results) {
            return results[1];
        }
        return false;
    }

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function removeEventListener(el, eventName, handler) {
  if (el.removeEventListener)
    el.removeEventListener(eventName, handler)
  else
    el.detachEvent('on' + eventName, handler)
}

removeEventListener(el, eventName, handler)

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function addEventListener(el, eventName, handler) {
  if (el.addEventListener)
    el.addEventListener(eventName, handler)
  else
    el.attachEvent('on' + eventName, handler)
}

addEventListener(el, eventName, handler)

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if (el.classList)
  el.classList.remove(className)
else
  el.className = el.className.replace(new RegExp('(^| )' + className.split(' ').join('|') + '( |$)', 'gi'), ' ')

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el.parentNode.removeChild(el)

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el.querySelectorAll(selector)

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function filter(selector, filterFn) {
  var elements = document.querySelectorAll(selector)
  var out = []
  for (var i = elements.length; i--;) {
    if (filterFn(elements[i]))
      out.unshift(elements[i])
  }
  return out
}

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function forEachElement(selector, fn) {
  var elements = document.querySelectorAll(selector)
  for (var i = 0; i < elements.length; i++)
    fn(elements[i], i)
}

forEachElement(selector, function(el, i){

})

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if (el.classList)
  el.classList.add(className)
else
  el.className += ' ' + className

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function fadeIn(el) {
  var opacity = 0

  el.style.opacity = 0
  el.style.filter = ''

  var last = +new Date
  var tick = function() {
    opacity += (new Date - last) / 400
    el.style.opacity = opacity