/folderone/foldertwo/filename.php?parameter=http%3A%2F%2Fwww.igmetall-sprockhoevel.de%2Fueber-uns%2Funser-leitbild.html&utf8=0&dir=sprockhoevel&updateJquery=jquery-1.6.2.min.js

var URL = (location.pathname+location.search).substr(1);
var filename = URL;
alert(filename);