function openPdfInNewWindow() {
    // a lovely fast case-insensitive regexp build from file extensions
    var rex = new RegExp('\\.(?:' + 'pdf' + ')$', 'i');
     
    // href und target sind native properties for links, no get() needed
    // no_class is now a required parameter
    var target = '_blank';
    var no_class = 'local'
     
    $$('a[href]:not(.' + no_class + ')').each(function(el) {
      if ( rex.test(el.href)) el.target = target;
    }); 
}