aAnonymousFrame->SetProperty(nsLayoutAtoms::IBSplitSpecialPrevSibling, aSpecialParent, nsnull);
aFrameManager->SetFrameProperty(aAnonymousFrame, nsLayoutAtoms::IBSplitSpecialPrevSibling, aSpecialParent, nsnull);
MarkIBSpecialPrevSibling(nsPresContext* aPresContext,                         nsFrameManager *aFrameManager,                         nsIFrame *aAnonymousFrame,                         nsIFrame *aSpecialParent){  aAnonymousFrame->SetProperty(nsLayoutAtoms::IBSplitSpecialPrevSibling,                               aSpecialParent, nsnull);}