gistfile1.js

function findMyOwnTag(mySrc) {
  var scripts = document.getElementsByTagName('script');
  for (var i = scripts.length-1; i >= 0; i--) {
    if (scripts[i].src && scripts[i].src.indexOf(mySrc) > -1) {
      return scripts[i]
    }
  }
}

myScriptNode = findMyOwnTag('bloader.js');