function Include( files ) {
 if( files.length == 0 ) {
  return;
 }
 if( !document.createElement ) {
  return;
 }
 
 for( index in files ) {
  if( '/' + files[ index ][ 0 ] == document.location.pathname || files[ index ][ 0 ] == '' ) {
   var script = document.createElement( 'script' );
 
   if( script ) {
    script.setAttribute( 'type', 'text/javascript' );
    script.setAttribute( 'src', files[ index ][ 1 ] );
 
    var head = document.getElementsByTagName( 'head' )[ 0 ];
    if( head ) {
     head.appendChild( script );
    }
   }
  }
 }
}
 
/* Aufruf der Include-Funktion. Ist das Erste Feld ein leerer String '', dann wird immer included */
 
Include( [ [ '', 'main.lib.js' ], [ 'messenger.php', 'messenger.class.js' ] ] );