editable poshytip plain jquery 1.9+ compatibility

This adds support for jQuery 1.9+ as shown by the latest Poshytip library.

The main problem is, that jQuery 1.9 drops the ```$.browser``` support, so detecting the IE6 is no longer possible using ```$.browser.msie```.

A possible substitution is already present in the latest Poshytip library, which i adapted here.