Fixed some minor fullscreen things, still not working

CubeControl/FullscreenWindow.java

+/*
+ * FullscreenWindow.java
+ *
+ *
+ * Copyright 2011 Thomas Buck <xythobuz@me.com>
+ * Copyright 2011 Max Nuding <max.nuding@gmail.com>
+ * Copyright 2011 Felix Bäder <baeder.felix@gmail.com>
+ *
+ * This file is part of LED-Cube.
+ *
+ * LED-Cube is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LED-Cube is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LED-Cube. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * This class is responsible for displaying the 3D View of our Cube in fullscreen mode.
+ * 
+ * @author Thomas Buck
+ * @author Max Nuding
+ * @author Felix Bäder
+ * @version 1.0
+ */
+
+
 import com.sun.j3d.utils.universe.*;
 import javax.media.j3d.*;
 import java.awt.*;
 			}
 		});
 		
-		canvas.setBounds(0,0, width, height-50);
+		canvas.setBounds(0,0, width, height-30);
 
 		
 		cp.add(exitButton);

CubeControl/Led3D.java

 	}
 	
 	public void enterFullscreen() {
-
-		group.removeChild(background);
+		if(group.indexOfChild(background) != -1){
+			group.removeChild(background);
+		}
 		group.addChild(fullscreenBackground);
 		
 	}
 	
 	public void leaveFullscreen() {
-		group.removeChild(fullscreenBackground);
+		if(group.indexOfChild(fullscreenBackground) != -1) {
+			group.removeChild(fullscreenBackground);
+		}
+		
 		group.addChild(background);
 		
 	}