diff --git a/content/dragboard.js.php b/content/dragboard.js.php
index 1e83adff1..4ef557e10 100644
--- a/content/dragboard.js.php
+++ b/content/dragboard.js.php
@@ -147,6 +147,7 @@ var LeLvbgrpDDObserver=
   	},
   	onDragOver: function(evt,flavour,session)
   	{
+		evt.preventDefault();
   	},
   	onDrop: function (evt,dropdata,session)
   	{
@@ -260,6 +261,7 @@ var LektorFunktionDDObserver=
   	},
   	onDragOver: function(evt,flavour,session)
   	{
+		evt.preventDefault();
   	},
   	onDrop: function (evt,dropdata,session)
   	{
@@ -347,6 +349,7 @@ var LeLektorDDObserver=
   	},
   	onDragOver: function(evt,flavour,session)
   	{
+		evt.preventDefault();
   	},
   	onDrop: function (evt,dropdata,session)
   	{
@@ -471,7 +474,7 @@ var boardObserver=
   	},
   	onDragOver: function(evt,flavour,session)
   	{
-  		
+  		evt.preventDefault();
   	},
   	onDrop: function (evt,dropdata,session)
   	{
@@ -551,6 +554,7 @@ var verbandtreeDDObserver=
   	},
   	onDragOver: function(evt,flavour,session)
   	{
+		evt.preventDefault();
   	},
   	onDrop: function (evt,dropdata,session)
   	{
@@ -629,4 +633,4 @@ var verbandtreeDDObserver=
 			StudentTreeRefresh();
 		}
   	}
-};
\ No newline at end of file
+};
diff --git a/content/fasoverlay.xul.php b/content/fasoverlay.xul.php
index f4f452be9..b5bdbbed2 100644
--- a/content/fasoverlay.xul.php
+++ b/content/fasoverlay.xul.php
@@ -56,6 +56,7 @@ echo '<?xul-overlay href="'.APP_ROOT.'content/mitarbeiter/mitarbeiteroverlay.xul
     ondraggesture="nsDragAndDrop.startDrag(event,lvbgrpDDObserver);"
 	datasources="../rdf/lehrverbandsgruppe.rdf.php" ref="http://www.technikum-wien.at/lehrverbandsgruppe/alle-verbaende"
 	ondragdrop="nsDragAndDrop.drop(event,verbandtreeDDObserver)"
+	ondrop="nsDragAndDrop.drop(event,verbandtreeDDObserver)"
 	ondragover="nsDragAndDrop.dragOver(event,verbandtreeDDObserver)"
 	ondragenter="nsDragAndDrop.dragEnter(event,verbandtreeDDObserver)"
 	ondragexit="nsDragAndDrop.dragExit(event,verbandtreeDDObserver)"
@@ -318,4 +319,4 @@ echo '<?xul-overlay href="'.APP_ROOT.'content/mitarbeiter/mitarbeiteroverlay.xul
 	</tabbox>
 </vbox>
 
-</overlay>
\ No newline at end of file
+</overlay>
diff --git a/content/lvplanung/lehrveranstaltungdetailoverlay.xul.php b/content/lvplanung/lehrveranstaltungdetailoverlay.xul.php
index a91ea65ec..f171a24e5 100644
--- a/content/lvplanung/lehrveranstaltungdetailoverlay.xul.php
+++ b/content/lvplanung/lehrveranstaltungdetailoverlay.xul.php
@@ -221,6 +221,7 @@ echo '<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>';
 				  flags="dont-build-content"
 				  style="border: 1px solid black;"
 				  ondragdrop="nsDragAndDrop.drop(event,LeLvbgrpDDObserver)"
+				  ondrop="nsDragAndDrop.drop(event,LeLvbgrpDDObserver)"
 				  ondragover="nsDragAndDrop.dragOver(event,LeLvbgrpDDObserver)"
   				  ondragenter="nsDragAndDrop.dragEnter(event,LeLvbgrpDDObserver)"
 				  ondragexit="nsDragAndDrop.dragExit(event,LeLvbgrpDDObserver)"
@@ -279,6 +280,7 @@ echo '<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>';
 						onselect="LeMitarbeiterAuswahl();" flags="dont-build-content"
 						style="border: 1px solid black;"
 						ondragdrop="nsDragAndDrop.drop(event,LeLektorDDObserver)"
+						ondrop="nsDragAndDrop.drop(event,LeLektorDDObserver)"
 						ondragover="nsDragAndDrop.dragOver(event,LeLektorDDObserver)"
 						ondragenter="nsDragAndDrop.dragEnter(event,LeLektorDDObserver)"
 						ondragexit="nsDragAndDrop.dragExit(event,LeLektorDDObserver)"
@@ -399,4 +401,4 @@ echo '<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>';
 		<spacer flex="1" />
 	</hbox>
 </vbox>
-</overlay>
\ No newline at end of file
+</overlay>