Accordion: IE9 B gives null references on paddingTop and paddingBottom

Given fxAttrs = ["height", "paddingTop", "paddingBottom"], (line 535) and an accordion that has been been clicked and is trying to expand...

var parts = ("" + $.css(options.toShow[0], prop)).match(/^([\\d+-.]+)(.*)$/); (line 548-ish) is setting parts to null for each of the paddingTop and paddingBottom attributes in IE9 (Beta 1 using IE9 Standards mode), which throws exceptions when setting showProps[prop] circa line 550 and again when accessing each of the showProps values circa line 572.

This can be sort-of worked around with a null-check on the setting of showProps[prop] circa line 550, like "if (parts == null) { showProps[prop] = { value: 0, unit: "px" }; } else ...". It doesn't quite look right, but it's mostly right and not throwing errors.

(The priority may be wrong if IE9 changes its behavior prior to release.)