var areaA = document.getElementById('area-a');
var areaB = document.getElementById('area-b');
areaC = document.getElementById('area-c');
splitter.Split(Splitter.Side.A, Splitter.Direction.Horizontal,
areaC);
+----------+ +----------+ | element | | A | | | -> +----------+ | | | B | +----------+ +----------+
+----------+ +----+-----+ | element | | | | | | -> | A | B | | | | | | +----------+ +----+-----+