} else if ("delete".equals(command)) {
data.deleteSentence(sentence);
} else if ("moveup".equals(command)) {
data.moveUp(sentence);
} else if ("movedown".equals(command)) {
data.moveDown(sentence);
} else if ("changelayout".equals(command)) {
data.changeLayout();
} else if ("resize".equals(command)) {
int width = Integer.parseInt(req.getParameter("width"));
int height = Integer.parseInt(req.getParameter("height"));