--- mozilla/dom/public/idl/base/nsIDOMWindow.idl	2004-04-18 03:20:08.000000000 +0530
+++ mozilla/dom/public/idl/base/nsIDOMWindow.idl	2009-04-03 17:13:58.000000000 +0530
@@ -137,6 +137,7 @@ interface nsIDOMWindow : nsISupports
    * Method for accessing this window's selection object.
    */
   nsISelection              getSelection();
+  PRInt32                   getPageHeight();
 
   /**
    * Method for scrolling this window by a number of lines.
--- mozilla/dom/src/base/nsGlobalWindow.cpp	2008-12-20 11:17:42.000000000 +0530
+++ mozilla/dom/src/base/nsGlobalWindow.cpp	2009-04-05 00:10:58.000000000 +0530
@@ -2806,6 +2806,29 @@ nsGlobalWindow::GetScrollbars(nsIDOMBarP
 }
 
 NS_IMETHODIMP
+nsGlobalWindow::GetPageHeight(PRInt32 *height)
+{
+  nsIScrollableView *view = nsnull;      
+  nsresult rv;
+  nsSize scrolledSize;
+
+  *height = 0;
+ 
+  FlushPendingNotifications(Flush_Layout);
+  GetScrollInfo(&view);
+  if (!view)
+    return NS_OK;
+
+  rv = view->GetContainerSize(&scrolledSize.width, &scrolledSize.height);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsRect portRect = view->View()->GetBounds();
+  *height = (int) nsPresContext::AppUnitsToFloatCSSPixels(scrolledSize.height);
+
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP
 nsGlobalWindow::GetDirectories(nsIDOMBarProp** aDirectories)
 {
   return GetPersonalbar(aDirectories);
@@ -3586,7 +3609,6 @@ nsGlobalWindow::GetScrollMaxXY(PRInt32*
   nsSize scrolledSize;
   rv = view->GetContainerSize(&scrolledSize.width, &scrolledSize.height);
   NS_ENSURE_SUCCESS(rv, rv);
-
   nsRect portRect = view->View()->GetBounds();
 
   if (aScrollMaxX)
--- mozilla/embedding/browser/gtk/src/EmbedPrivate.cpp	2008-01-30 09:58:26.000000000 +0530
+++ mozilla/embedding/browser/gtk/src/EmbedPrivate.cpp	2009-04-05 00:12:37.000000000 +0530
@@ -483,6 +483,25 @@ EmbedPrivate::ApplyChromeMask()
    }
 }
 
+int
+EmbedPrivate::GetPageHeight()
+{
+  nsresult rv;
+  PRInt32 h;
+
+  nsCOMPtr<nsIWebBrowser> webBrowser;
+  rv = mWindow->GetWebBrowser(getter_AddRefs(webBrowser));
+  if (NS_FAILED(rv))
+	  return -1;
+  
+  nsCOMPtr<nsIWebBrowserFocus> webBrowserFocus(do_QueryInterface(webBrowser));
+  if (!webBrowserFocus)
+	  return -1;
+   webBrowserFocus->GetPageHeight (&h);
+   
+   return h;
+}
+
 
 void
 EmbedPrivate::SetChromeMask(PRUint32 aChromeMask)
@@ -808,7 +827,7 @@ EmbedPrivate::ChildFocusOut(void)
   nsCOMPtr<nsIWebBrowserFocus> webBrowserFocus(do_QueryInterface(webBrowser));
   if (!webBrowserFocus)
 	  return;
-  
+
   webBrowserFocus->Deactivate();
 }
 
--- mozilla/embedding/browser/gtk/src/EmbedPrivate.h	2008-01-30 09:58:26.000000000 +0530
+++ mozilla/embedding/browser/gtk/src/EmbedPrivate.h	2009-04-03 16:46:58.000000000 +0530
@@ -82,6 +82,7 @@ class EmbedPrivate {
 
   void        SetChromeMask   (PRUint32 chromeMask);
   void        ApplyChromeMask ();
+  int         GetPageHeight   ();
 
   static void PushStartup     (void);
   static void PopStartup      (void);
--- mozilla/embedding/browser/gtk/src/gtkmozembed2.cpp	2008-01-30 09:58:26.000000000 +0530
+++ mozilla/embedding/browser/gtk/src/gtkmozembed2.cpp	2009-04-05 00:13:16.000000000 +0530
@@ -711,6 +711,20 @@ gtk_moz_embed_stop_load(GtkMozEmbed *emb
     embedPrivate->mNavigation->Stop(nsIWebNavigation::STOP_ALL);
 }
 
+int
+gtk_moz_embed_get_page_height(GtkMozEmbed *embed)
+{
+  EmbedPrivate *embedPrivate;
+  
+  g_return_val_if_fail(embed != NULL, 0);
+  g_return_val_if_fail(GTK_IS_MOZ_EMBED(embed), 0);
+
+  embedPrivate = (EmbedPrivate *)embed->data;
+
+  return embedPrivate->GetPageHeight();
+}
+
+
 gboolean
 gtk_moz_embed_can_go_back(GtkMozEmbed *embed)
 {
--- mozilla/embedding/browser/gtk/src/gtkmozembed.h	2008-01-12 03:46:15.000000000 +0530
+++ mozilla/embedding/browser/gtk/src/gtkmozembed.h	2009-04-05 00:13:47.000000000 +0530
@@ -156,6 +156,8 @@ GTKMOZEMBED_API(gboolean,  gtk_moz_embed
 GTKMOZEMBED_API(gboolean,  gtk_moz_embed_can_go_forward,  (GtkMozEmbed *embed))
 GTKMOZEMBED_API(void,      gtk_moz_embed_go_back,         (GtkMozEmbed *embed))
 GTKMOZEMBED_API(void,      gtk_moz_embed_go_forward,      (GtkMozEmbed *embed))
+GTKMOZEMBED_API(int,       gtk_moz_embed_get_page_height, (GtkMozEmbed *embed))
+
 GTKMOZEMBED_API(void,   gtk_moz_embed_render_data,     (GtkMozEmbed *embed, 
                                                         const char *data,
                                                         guint32 len,
--- mozilla/embedding/browser/webBrowser/nsIWebBrowserFocus.idl	2004-04-19 03:30:41.000000000 +0530
+++ mozilla/embedding/browser/webBrowser/nsIWebBrowserFocus.idl	2009-04-04 15:28:46.000000000 +0530
@@ -85,7 +85,7 @@ interface nsIWebBrowserFocus : nsISuppor
    * correctly.
    */
   void deactivate();
-
+  PRInt32 getPageHeight();
   /**
    * Give the first element focus within mozilla
    * (i.e. TAB was pressed and focus should enter mozilla)
--- mozilla/embedding/browser/webBrowser/nsWebBrowser.cpp	2008-04-06 17:58:36.000000000 +0530
+++ mozilla/embedding/browser/webBrowser/nsWebBrowser.cpp	2009-04-05 00:15:11.000000000 +0530
@@ -1804,7 +1804,7 @@ NS_IMETHODIMP nsWebBrowser::Deactivate(v
      the presumed other newly active window to set it when it comes in.
      This seems harmless and maybe safer, but we have no real evidence
      either way just yet. */
-
+  
   nsCOMPtr<nsIDOMWindow> domWindow;
   GetContentDOMWindow(getter_AddRefs(domWindow));
   if (domWindow) {
@@ -1818,6 +1818,24 @@ NS_IMETHODIMP nsWebBrowser::Deactivate(v
     }
   }
 
+  return NS_OK;
+}
+
+/* void GetPageHeight (); */
+NS_IMETHODIMP nsWebBrowser::GetPageHeight(PRInt32 *h)
+{
+  nsCOMPtr<nsIDOMWindow> domWindow;
+  GetContentDOMWindow(getter_AddRefs(domWindow));
+  if (domWindow) {
+    nsCOMPtr<nsPIDOMWindow> privateDOMWindow = do_QueryInterface(domWindow);
+    if(privateDOMWindow) {
+      nsIFocusController *focusController =
+          privateDOMWindow->GetRootFocusController();
+      privateDOMWindow->GetPageHeight(h);
+     
+    }
+  }
+
   return NS_OK;
 }