Adds global state check for old IE (7) and makes clicking options work
Adds global state check for old IE (7) and makes clicking options work

Adds option (state) "isOldIE" which is set to true if $.browser is
present and checks positive for ie7.

Also makes clicking options work in ie7 (by replacing the click event
with mouseup event which is the bizar fix).

lou/multi-select,lou/multi-select