tunderdomb

if ( typeof document.currentScript == "undefined" && document.__defineGetter__ ) {
  document.__defineGetter__("currentScript", function (){
    try {
      throw new Error()
    }
    catch ( e ) {
      var qualifiedUrl = location.protocol + "//" + location.host
        , srcs = e.stack.match(new RegExp(qualifiedUrl + ".*?\\.js", 'g'))
        , src = srcs[srcs.length - 1]
        , absoluteUrl = src.replace(qualifiedUrl, "")

tunderdomb

// get the actually scrollable element
function getScrollable( root ){
  if ( !root.nodeName || !!~["iframe", "#document", "html", "body"].indexOf(root.nodeName.toLowerCase()) ) {
    var doc = (root.contentWindow || root).document || root.ownerDocument || root
    root = /webkit/i.test(navigator.userAgent) || doc.compatMode == "BackCompat"
      ? doc.body
      : doc.documentElement;
  }
  return root
}