currentTarget issue in IE8

There is no currentTarget in IE8. So withAttr() fails in it.
But 'this' is binded to that already. It's Ok.

More info:
http://stackoverflow.com/questions/857439/internet-explorer-and-javascript-event-currenttarget
http://www.brainjar.com/dhtml/events/default3.asp
Merge pull request #187 from oleg8sh/patch-4

currentTarget issue in IE8