#610204 by effulgentsia, Gábor Hojtsy, sun, Damien Tournoud and ksenzee: API changes to support overlays: lays ground work for implementation.

- Patch #444344 by kkaefer, sun, Rob Loach: this change introduces a jQuery .once() method which streamlines the way behavior functions work. Previously, we had to manually ensure that an element is only initialized once. Usually, this happens by adding classes and selecting only those elements which do not have that class. However, this process can be separated out into a jQuery ‘filtering’ function which does all the grunt work.

#125030 by kkaefer, quicksketch, dvessel, Steven, and John Resig: Allow compatibility with other JavaScript libraries.

#208991 by JirkaRybka: target sticky table headers to Drupal output tables only, so it won't sticky random tables in other site content

#208197 by dvessel: back to cloning the table header only in tableheader.js (fixes radio button issues and Safari 2 crashing)

#194590 by scor, JirkaRybka, attiks, dvessel; with heavy testing by catch: fix a dozen issues with sticky table headers

- Patch #179937 by quicksketch: made the table header magic more robust.  When a table disappears from the HTML, an error would otherwise be thrown.

#171866 by kkaefer and dvessel: prevent the tableheader script from running in IE less then v7, because of incompatibility

#134307 by dww, Stefan Nantegaal and dvessel: fix table headers interaction with Safari, so the fieldset contents will not disappear