Jquery Stop Fadein / Fadeout

This is a fairly easy one, but I cant seem to figure it out.

jquery tabbed trade click for mouse over

I'm using some one else's plugin and I see that it has configurations available, ie. 'tabs:true'(see below). When I look at the plugin file it's just one long line that includes some of these settings separated by pipes '|' like,

In jQuery what's the best way to add a class on mouseover and remove it on mouseout?

Is there a jQuery shortcut for this?