jQuery check plugin exists

if (!!$.prototype.cluetip)
$('a.cluetip').cluetip({
local:true,
cursor: 'pointer',
dropShadow: false,
dropShadowSteps: 0,
showTitle: false,
tracking: true,
sticky: false,
mouseOutClose: true,
fx: {
open: 'fadeIn',
openSpeed: 'fast'
}
}).css('opacity', 0.8);