var yuipath = 'clientscript/yui';
var yuicombopath = '';
var remoteyui = false;
else // Load Rest of YUI remotely (where possible)
var yuipath = 'http://yui.yahooapis.com/2.9.0/build';
var yuicombopath = 'http://yui.yahooapis.com/combo';
var remoteyui = true;
Basically, it's an exception that allows a team to acquire a player by trade (and only by trade) without sending equivalent salary back.
You can get a trade exception by trading a player to a team who has a trade exception or cap room without acquiring anything back. For example, Toronto has a trade exception of 7.6 million from the Barbosa trade. You can also get one if you acquire less salary back in a trade. If a team is under the cap, they lose the exception.