diff --git a/mozilla/layout/generic/nsGfxScrollFrame.cpp b/mozilla/layout/generic/nsGfxScrollFrame.cpp
index 1b1bbf9073c..c31ef5e3efb 100644
--- a/mozilla/layout/generic/nsGfxScrollFrame.cpp
+++ b/mozilla/layout/generic/nsGfxScrollFrame.cpp
@@ -71,7 +71,7 @@
 
 #include "nsIPrintPreviewContext.h"
 #include "nsIURI.h"
-
+#include "nsGUIEvent.h"
 //----------------------------------------------------------------------
 
 class nsGfxScrollFrameInner : public nsIDocumentObserver, 
@@ -890,6 +890,8 @@ nsGfxScrollFrameInner::AttributeChanged(nsIDocument *aDocument,
      hframe->GetContent(getter_AddRefs(hcontent));
      vframe->GetContent(getter_AddRefs(vcontent));
 
+     nsIFrame  * targetFrame = nsnull;
+     nsCOMPtr<nsIContent> targetContent;
      if (hcontent.get() == aContent  || vcontent.get() == aContent)
      {
         nscoord x = 0;
@@ -902,6 +904,8 @@ nsGfxScrollFrameInner::AttributeChanged(nsIDocument *aDocument,
 
            // convert it to an integer
            x = value.ToInteger(&error);
+           targetFrame = hframe;
+           targetContent = hcontent;
         }
 
         if (NS_CONTENT_ATTR_HAS_VALUE == vcontent->GetAttr(kNameSpaceID_None, nsXULAtoms::curpos, value))
@@ -910,8 +914,23 @@ nsGfxScrollFrameInner::AttributeChanged(nsIDocument *aDocument,
 
            // convert it to an integer
            y = value.ToInteger(&error);
+           targetFrame = vframe;
+           targetContent = vcontent;
         }
 
+        nsScrollbarEvent  event;
+        event.eventStructType = NS_SCROLLBAR_EVENT;
+        event.message = NS_SCROLL_EVENT;
+        event.flags = 0;        
+        nsEventStatus status = nsEventStatus_eIgnore;
+        nsCOMPtr<nsIPresShell> presShell;
+        mOuter->mPresContext->GetShell(getter_AddRefs(presShell));
+        
+        // Fire the onScroll event.
+        if (presShell && targetFrame && targetContent)
+          presShell->HandleEventWithTarget(&event, targetFrame, targetContent,
+                                            NS_EVENT_FLAG_INIT, &status);
+
         nsIScrollableView* s = GetScrollableView(mOuter->mPresContext);
         s->RemoveScrollPositionListener(this);
         ScrollbarChanged(mOuter->mPresContext, x*mOnePixel, y*mOnePixel);
diff --git a/mozilla/layout/html/base/src/nsGfxScrollFrame.cpp b/mozilla/layout/html/base/src/nsGfxScrollFrame.cpp
index 1b1bbf9073c..c31ef5e3efb 100644
--- a/mozilla/layout/html/base/src/nsGfxScrollFrame.cpp
+++ b/mozilla/layout/html/base/src/nsGfxScrollFrame.cpp
@@ -71,7 +71,7 @@
 
 #include "nsIPrintPreviewContext.h"
 #include "nsIURI.h"
-
+#include "nsGUIEvent.h"
 //----------------------------------------------------------------------
 
 class nsGfxScrollFrameInner : public nsIDocumentObserver, 
@@ -890,6 +890,8 @@ nsGfxScrollFrameInner::AttributeChanged(nsIDocument *aDocument,
      hframe->GetContent(getter_AddRefs(hcontent));
      vframe->GetContent(getter_AddRefs(vcontent));
 
+     nsIFrame  * targetFrame = nsnull;
+     nsCOMPtr<nsIContent> targetContent;
      if (hcontent.get() == aContent  || vcontent.get() == aContent)
      {
         nscoord x = 0;
@@ -902,6 +904,8 @@ nsGfxScrollFrameInner::AttributeChanged(nsIDocument *aDocument,
 
            // convert it to an integer
            x = value.ToInteger(&error);
+           targetFrame = hframe;
+           targetContent = hcontent;
         }
 
         if (NS_CONTENT_ATTR_HAS_VALUE == vcontent->GetAttr(kNameSpaceID_None, nsXULAtoms::curpos, value))
@@ -910,8 +914,23 @@ nsGfxScrollFrameInner::AttributeChanged(nsIDocument *aDocument,
 
            // convert it to an integer
            y = value.ToInteger(&error);
+           targetFrame = vframe;
+           targetContent = vcontent;
         }
 
+        nsScrollbarEvent  event;
+        event.eventStructType = NS_SCROLLBAR_EVENT;
+        event.message = NS_SCROLL_EVENT;
+        event.flags = 0;        
+        nsEventStatus status = nsEventStatus_eIgnore;
+        nsCOMPtr<nsIPresShell> presShell;
+        mOuter->mPresContext->GetShell(getter_AddRefs(presShell));
+        
+        // Fire the onScroll event.
+        if (presShell && targetFrame && targetContent)
+          presShell->HandleEventWithTarget(&event, targetFrame, targetContent,
+                                            NS_EVENT_FLAG_INIT, &status);
+
         nsIScrollableView* s = GetScrollableView(mOuter->mPresContext);
         s->RemoveScrollPositionListener(this);
         ScrollbarChanged(mOuter->mPresContext, x*mOnePixel, y*mOnePixel);