--If the mouse rolls over the sprite to which this behavior is attached, and this sprite's castMember is called "NeuName", it's switched to castMemner "NeuName-rol" and the cast member of a sprite occupied by invisible place holder "invis,-Suffix1" is switched to castMember "NeuName-Suffix1", the cast member of a sprite occupied by invisible place holder "invis,-Suffix2" is switched to castMember "NeuName-Suffix2" and so on.