better use of cached div
better use of cached div

ddeveloperr/picturefill,purposeindustries/picturefill,purposeindustries/picturefill,scottjehl/picturefill,scottjehl/picturefill,rockmandew/picturefill,iancrowther/picturefill,guardian/picturefill,footiealf/picturefill,yufi113/picturefill,mcanthony/picturefill,mcanthony/picturefill,chrismcandrew/picturefill,footiealf/picturefill,chrismcandrew/picturefill,patrickkettner/picturefill,yubin-huang/picturefill,samiadelgado/picturefill,guardian/picturefill,demateu/picturefill,ddeveloperr/picturefill,patrickkettner/picturefill,albell/picturefill,yufi113/picturefill,rockmandew/picturefill,iancrowther/picturefill,yubin-huang/picturefill,nucliweb/picturefill,samiadelgado/picturefill,albell/picturefill,demateu/picturefill