[fix] DatePicker showCurrentAtPos.

[fix] DatePicker showCurrentAtPos.


Hi, everyone!
When you set 'showCurrentAtPos' option to 1, DatePicker acts like it
was set to 2.
For example, if numberOfMonths==2 and you select August, the 21st,
you'll se June and July months (July and August expected).
This bug presents in 1.7.2 and 1.8.1 versions.
How to fix it:
open ui.datepicker.js, find "var drawMonth = inst.drawMonth -
showCurrentAtPos;" line (1277 for 1.7.2) and replace it with
    if (showCurrentAtPos == 0)
     var drawMonth = inst.drawMonth - showCurrentAtPos;
    else
     var drawMonth = inst.selectedMonth - showCurrentAtPos;
So, it will work fine for all showCurrentAtPos values.