diff --git a/dom/src/base/nsJSScreen.cpp b/dom/src/base/nsJSScreen.cpp
index 8f508af2b9c..232ab651971 100644
--- a/dom/src/base/nsJSScreen.cpp
+++ b/dom/src/base/nsJSScreen.cpp
@@ -46,14 +46,16 @@ static NS_DEFINE_IID(kIScreenIID, NS_IDOMSCREEN_IID);
 // Screen property ids
 //
 enum Screen_slots {
-  SCREEN_WIDTH = -1,
-  SCREEN_HEIGHT = -2,
-  SCREEN_PIXELDEPTH = -3,
-  SCREEN_COLORDEPTH = -4,
-  SCREEN_AVAILWIDTH = -5,
-  SCREEN_AVAILHEIGHT = -6,
-  SCREEN_AVAILLEFT = -7,
-  SCREEN_AVAILTOP = -8
+  SCREEN_TOP = -1,
+  SCREEN_LEFT = -2,
+  SCREEN_WIDTH = -3,
+  SCREEN_HEIGHT = -4,
+  SCREEN_PIXELDEPTH = -5,
+  SCREEN_COLORDEPTH = -6,
+  SCREEN_AVAILWIDTH = -7,
+  SCREEN_AVAILHEIGHT = -8,
+  SCREEN_AVAILLEFT = -9,
+  SCREEN_AVAILTOP = -10
 };
 
 /***********************************************************************/
@@ -76,6 +78,30 @@ GetScreenProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
     if (!secMan)
         return PR_FALSE;
     switch(JSVAL_TO_INT(id)) {
+      case SCREEN_TOP:
+      {
+        rv = secMan->CheckScriptAccess(cx, obj, NS_DOM_PROP_SCREEN_TOP, PR_FALSE);
+        if (NS_SUCCEEDED(rv)) {
+          PRInt32 prop;
+          rv = a->GetTop(&prop);
+          if (NS_SUCCEEDED(rv)) {
+            *vp = INT_TO_JSVAL(prop);
+          }
+        }
+        break;
+      }
+      case SCREEN_LEFT:
+      {
+        rv = secMan->CheckScriptAccess(cx, obj, NS_DOM_PROP_SCREEN_LEFT, PR_FALSE);
+        if (NS_SUCCEEDED(rv)) {
+          PRInt32 prop;
+          rv = a->GetLeft(&prop);
+          if (NS_SUCCEEDED(rv)) {
+            *vp = INT_TO_JSVAL(prop);
+          }
+        }
+        break;
+      }
       case SCREEN_WIDTH:
       {
         rv = secMan->CheckScriptAccess(cx, obj, NS_DOM_PROP_SCREEN_WIDTH, PR_FALSE);
@@ -275,6 +301,8 @@ JSClass ScreenClass = {
 //
 static JSPropertySpec ScreenProperties[] =
 {
+  {"top",    SCREEN_TOP,    JSPROP_ENUMERATE | JSPROP_READONLY},
+  {"left",    SCREEN_LEFT,    JSPROP_ENUMERATE | JSPROP_READONLY},
   {"width",    SCREEN_WIDTH,    JSPROP_ENUMERATE | JSPROP_READONLY},
   {"height",    SCREEN_HEIGHT,    JSPROP_ENUMERATE | JSPROP_READONLY},
   {"pixelDepth",    SCREEN_PIXELDEPTH,    JSPROP_ENUMERATE | JSPROP_READONLY},
diff --git a/dom/src/base/nsScreen.cpp b/dom/src/base/nsScreen.cpp
index 9a88ca14e24..4864652cf05 100644
--- a/dom/src/base/nsScreen.cpp
+++ b/dom/src/base/nsScreen.cpp
@@ -83,10 +83,53 @@ ScreenImpl::GetScriptObject(nsIScriptContext *aContext, void** aScriptObject)
   return res;
 }
 
+
+NS_IMETHODIMP
+ScreenImpl::GetTop(PRInt32* aTop)
+{
+/*
+ *** for now...
+	nsCOMPtr<nsIDeviceContext> context ( getter_AddRefs(GetDeviceContext() );
+	if ( context )
+	{
+		PRInt32 left;
+		context->GetDeviceTopLeft( *aTop, left );
+		float devUnits;
+		context->GetDevUnitsToAppUnits(devUnits);
+		*aTop = NSToIntRound(float(*aTop) / devUnits );
+		return NS_OK;
+	}
+ */
+  *aTop = -1;
+  return NS_ERROR_FAILURE;
+}
+
+
+NS_IMETHODIMP
+ScreenImpl::GetLeft(PRInt32* aLeft)
+{
+/*
+ *** for now...
+	nsCOMPtr<nsIDeviceContext> context ( getter_AddRefs(GetDeviceContext() );
+	if ( context )
+	{
+		PRInt32 top;
+		context->GetDeficeTopLeft( top, *aLeft );
+		float devUnits;
+		context->GetDevUnitsToAppUnits(devUnits);
+		*aLeft = NSToIntRound(float(*aLeft) / devUnits );
+		return NS_OK;
+	}
+ */
+  *aLeft = -1;
+  return NS_ERROR_FAILURE;
+}
+
+
 NS_IMETHODIMP
 ScreenImpl::GetWidth(PRInt32* aWidth)
 {
-	nsIDeviceContext* context = GetDeviceContext();
+	nsCOMPtr<nsIDeviceContext> context ( getter_AddRefs(GetDeviceContext()) );
 	if ( context )
 	{
 		PRInt32 height;
@@ -94,7 +137,6 @@ ScreenImpl::GetWidth(PRInt32* aWidth)
 		float devUnits;
 		context->GetDevUnitsToAppUnits(devUnits);
 		*aWidth = NSToIntRound(float( *aWidth) / devUnits );
-		NS_RELEASE( context );
 		return NS_OK;
 	}
 
@@ -105,7 +147,7 @@ ScreenImpl::GetWidth(PRInt32* aWidth)
 NS_IMETHODIMP
 ScreenImpl::GetHeight(PRInt32* aHeight)
 {
-	nsIDeviceContext* context = GetDeviceContext();
+	nsCOMPtr<nsIDeviceContext> context ( getter_AddRefs(GetDeviceContext()) );
 	if ( context )
 	{
 		PRInt32 width;
@@ -113,7 +155,6 @@ ScreenImpl::GetHeight(PRInt32* aHeight)
 		float devUnits;
 		context->GetDevUnitsToAppUnits(devUnits);
 		*aHeight = NSToIntRound(float( *aHeight) / devUnits );
-		NS_RELEASE( context );
 		return NS_OK;
 	}
 	
@@ -124,13 +165,12 @@ ScreenImpl::GetHeight(PRInt32* aHeight)
 NS_IMETHODIMP
 ScreenImpl::GetPixelDepth(PRInt32* aPixelDepth)
 {
-	nsIDeviceContext* context = GetDeviceContext();
+	nsCOMPtr<nsIDeviceContext> context ( getter_AddRefs(GetDeviceContext()) );
 	if ( context )
 	{
 		PRUint32 depth;
 		context->GetDepth( depth  );
 		*aPixelDepth = depth;
-		NS_RELEASE( context );
 		return NS_OK;
 	}
   //XXX not implmented
@@ -141,13 +181,12 @@ ScreenImpl::GetPixelDepth(PRInt32* aPixelDepth)
 NS_IMETHODIMP
 ScreenImpl::GetColorDepth(PRInt32* aColorDepth)
 {
-	nsIDeviceContext* context = GetDeviceContext();
+	nsCOMPtr<nsIDeviceContext> context ( getter_AddRefs(GetDeviceContext()) );
 	if ( context )
 	{
 		PRUint32 depth;
 		context->GetDepth( depth  );
 		*aColorDepth = depth;
-		NS_RELEASE( context );
 		return NS_OK;
 	}
   
@@ -158,19 +197,16 @@ ScreenImpl::GetColorDepth(PRInt32* aColorDepth)
 NS_IMETHODIMP
 ScreenImpl::GetAvailWidth(PRInt32* aAvailWidth)
 {
-
-  
-  nsIDeviceContext* context = GetDeviceContext();
+	nsCOMPtr<nsIDeviceContext> context ( getter_AddRefs(GetDeviceContext()) );
   if ( context )
   {
-	nsRect rect;
-	context->GetClientRect( rect  );
-	float devUnits;
-	context->GetDevUnitsToAppUnits(devUnits);
-	*aAvailWidth = NSToIntRound(float( rect.width) / devUnits );
-	NS_RELEASE( context );
-	return NS_OK;
- }
+	  nsRect rect;
+	  context->GetClientRect( rect  );
+	  float devUnits;
+	  context->GetDevUnitsToAppUnits(devUnits);
+	  *aAvailWidth = NSToIntRound(float( rect.width) / devUnits );
+	  return NS_OK;
+  }
 
   *aAvailWidth = -1;
   return NS_ERROR_FAILURE;
@@ -180,17 +216,16 @@ ScreenImpl::GetAvailWidth(PRInt32* aAvailWidth)
 NS_IMETHODIMP
 ScreenImpl::GetAvailHeight(PRInt32* aAvailHeight)
 {
- nsIDeviceContext* context = GetDeviceContext();
+	nsCOMPtr<nsIDeviceContext> context ( getter_AddRefs(GetDeviceContext()) );
   if ( context )
   {
-	nsRect rect;
-	context->GetClientRect( rect  );
-	float devUnits;
-	context->GetDevUnitsToAppUnits(devUnits);
-	*aAvailHeight = NSToIntRound(float( rect.height) / devUnits );
-	NS_RELEASE( context );
-	return NS_OK;
- }
+	  nsRect rect;
+	  context->GetClientRect( rect  );
+	  float devUnits;
+	  context->GetDevUnitsToAppUnits(devUnits);
+	  *aAvailHeight = NSToIntRound(float( rect.height) / devUnits );
+	  return NS_OK;
+  }
 
   *aAvailHeight = -1;
   return NS_ERROR_FAILURE;
@@ -200,16 +235,15 @@ ScreenImpl::GetAvailHeight(PRInt32* aAvailHeight)
 NS_IMETHODIMP
 ScreenImpl::GetAvailLeft(PRInt32* aAvailLeft)
 {
- 	 nsIDeviceContext* context = GetDeviceContext();
+	nsCOMPtr<nsIDeviceContext> context ( getter_AddRefs(GetDeviceContext()) );
   if ( context )
   {
-	nsRect rect;
-	context->GetClientRect( rect  );
-	float devUnits;
-	context->GetDevUnitsToAppUnits(devUnits);
-	*aAvailLeft = NSToIntRound(float( rect.x) / devUnits );
-	NS_RELEASE( context );
-	return NS_OK;
+	  nsRect rect;
+	  context->GetClientRect( rect  );
+	  float devUnits;
+	  context->GetDevUnitsToAppUnits(devUnits);
+	  *aAvailLeft = NSToIntRound(float( rect.x) / devUnits );
+	  return NS_OK;
  }
 
   *aAvailLeft = -1;
@@ -219,17 +253,16 @@ ScreenImpl::GetAvailLeft(PRInt32* aAvailLeft)
 NS_IMETHODIMP
 ScreenImpl::GetAvailTop(PRInt32* aAvailTop)
 {
-  	 nsIDeviceContext* context = GetDeviceContext();
+	nsCOMPtr<nsIDeviceContext> context ( getter_AddRefs(GetDeviceContext()) );
   if ( context )
   {
-	nsRect rect;
-	context->GetClientRect( rect  );
-	float devUnits;
-	context->GetDevUnitsToAppUnits(devUnits);
-	*aAvailTop = NSToIntRound(float( rect.y) / devUnits );
-	NS_RELEASE( context );
-	return NS_OK;
- }
+	  nsRect rect;
+	  context->GetClientRect( rect  );
+	  float devUnits;
+	  context->GetDevUnitsToAppUnits(devUnits);
+	  *aAvailTop = NSToIntRound(float( rect.y) / devUnits );
+	  return NS_OK;
+  }
 
   *aAvailTop = -1;
   return NS_ERROR_FAILURE;
diff --git a/dom/src/base/nsScreen.h b/dom/src/base/nsScreen.h
index f9dce986a02..ae504ea004c 100644
--- a/dom/src/base/nsScreen.h
+++ b/dom/src/base/nsScreen.h
@@ -44,6 +44,8 @@ public:
   NS_IMETHOD GetScriptObject(nsIScriptContext *aContext, void** aScriptObject);
   NS_IMETHOD SetScriptObject(void *aScriptObject);
 
+  NS_IMETHOD GetTop(PRInt32* aWidth);
+  NS_IMETHOD GetLeft(PRInt32* aWidth);
   NS_IMETHOD GetWidth(PRInt32* aWidth);
   NS_IMETHOD GetHeight(PRInt32* aHeight);
   NS_IMETHOD GetPixelDepth(PRInt32* aPixelDepth);