fix showoff:loaded event
fix showoff:loaded event

There is no .preso element
ivanoats/parade,wanix/showoff,jevy/Presentations,nberger/showoff,kublaj/showoff,berkes/showoff,puppetlabs/showoff,wanix/showoff,marrero984/showoff,rkh/showoff,marrero984/showoff,marrero984/showoff,nomadicoder/showoff,berkes/showoff,binford2k/showoff,ivanoats/parade,burtlo/parade,hybridgroup/showoff,travisvalentine/7.27_showoff,puppetlabs/showoff,puppetlabs/showoff,amiel/showoff,jevy/Presentations,slambert/showoff,berkes/showoff,slambert/showoff,kublaj/showoff,amiel/showoff,marrero984/showoff,slambert/showoff,nomadicoder/showoff,berkes/showoff,kublaj/showoff,puppetlabs/showoff,nberger/showoff,binford2k/showoff,wanix/showoff,nomadicoder/showoff,binford2k/showoff,travisvalentine/7.27_showoff,rkh/showoff,guidance/nodejs-craft1933,binford2k/showoff,guidance/nodejs-craft1933,kublaj/showoff,berkes/showoff,hybridgroup/showoff,burtlo/parade,slambert/showoff,nomadicoder/showoff,kublaj/showoff