[TYPO3-core] Gremlin #1577: use ajax to open popup menus

[Sebastian Kurfuerst]

User writes:

on browsers where it is supported, ajax technology could be used to
fetch and update the page tree in the BE dynamically, and load popup
menus.

Solution:

      * t3lib_ajax is created, handles basic XMLHTTPrequest things
      * all clickmenus are opened with ajax if supported
      * fully backwards-compatible, if there is no
        xmlhttp-request-object available in the browser the old method
        by reloading the top frame is used.

Notes:
      * there is no optimisation done in alt_clickmenu.php, but the
        speed increase is notable. On my test system, it was one second
        faster than without ajax.

Greets,
Sebastian

-- 
Sebastian Kurfuerst
http://garbage-group.de/kontakt.html
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