diff --git a/src/html/helpdata.cpp b/src/html/helpdata.cpp
index bc928a7ccb..0c34284d53 100644
--- a/src/html/helpdata.cpp
+++ b/src/html/helpdata.cpp
@@ -34,6 +34,7 @@
 #include "wx/busyinfo.h"
 #include "wx/encconv.h"
 #include "wx/fontmap.h"
+#include "wx/log.h"
 #include "wx/html/htmlpars.h"
 #include "wx/html/htmldefs.h"
 
@@ -233,6 +234,8 @@ bool wxHtmlHelpData::LoadMSProject(wxHtmlBookRecord *book, wxFileSystem& fsys, c
         handler -> WriteOut(m_Contents, m_ContentsCnt);
         delete[] buf;
     }
+    else
+        wxLogError(_("Cannot open contents file: %s"), contentsfile.mb_str());
 
     f = ( indexfile.IsEmpty() ? 0 : fsys.OpenFile(indexfile) );
     if (f) {
@@ -246,6 +249,8 @@ bool wxHtmlHelpData::LoadMSProject(wxHtmlBookRecord *book, wxFileSystem& fsys, c
         handler -> WriteOut(m_Index, m_IndexCnt);
         delete[] buf;
     }
+    else
+        wxLogError(_("Cannot open index file: %s"), indexfile.mb_str());
     return TRUE;
 }
 
@@ -278,9 +283,13 @@ bool wxHtmlHelpData::LoadCachedBook(wxHtmlBookRecord *book, wxInputStream *f)
     f -> Read(&x, sizeof(x));
     version = wxINT32_SWAP_ON_BE(x);
     
-    if (version != CURRENT_CACHED_BOOK_VERSION) return FALSE;
+    if (version != CURRENT_CACHED_BOOK_VERSION) 
+    {
+        wxLogError(_("Incorrect version of HTML help book"));
+        return FALSE;
         // NOTE: when adding new version, please ensure backward compatibility!
-
+    }
+    
     /* load contents : */
 
     f -> Read(&x, sizeof(x));
@@ -517,7 +526,11 @@ bool wxHtmlHelpData::AddBook(const wxString& book)
         else bookFull = wxGetCwd() + "/" + book;
 
         fi = fsys.OpenFile(bookFull);
-        if (fi == NULL) return FALSE;
+        if (fi == NULL) 
+	{
+	    wxLogError(_("Cannot open HTML help book: %s"), bookFull.mb_str());
+	    return FALSE;
+	}
         fsys.ChangePathTo(bookFull);
         s = fi -> GetStream();
         sz = s -> GetSize();
diff --git a/src/html/htmlfilt.cpp b/src/html/htmlfilt.cpp
index 199b91c6c4..fff367cc45 100644
--- a/src/html/htmlfilt.cpp
+++ b/src/html/htmlfilt.cpp
@@ -141,7 +141,11 @@ wxString wxHtmlFilterHTML::ReadFile(const wxFSFile& file) const
     char *src;
     wxString doc;
 
-    if (s == NULL) return wxEmptyString;
+    if (s == NULL) 
+    {
+        wxLogError(_("Cannot open HTML document: %s"), file.GetLocation().mb_str());
+        return wxEmptyString;
+    }
     src = new char[s -> GetSize() + 1];
     src[s -> GetSize()] = 0;
     s -> Read(src, s -> GetSize());
diff --git a/src/html/htmlpars.cpp b/src/html/htmlpars.cpp
index 5c07054f58..4cec1c5cd1 100644
--- a/src/html/htmlpars.cpp
+++ b/src/html/htmlpars.cpp
@@ -173,7 +173,12 @@ void wxHtmlParser::PopTagHandler()
 {
     wxNode *first;
     
-    if (m_HandlersStack == NULL || (first = m_HandlersStack -> GetFirst()) == NULL) return;
+    if (m_HandlersStack == NULL || 
+        (first = m_HandlersStack -> GetFirst()) == NULL) 
+    {
+        wxLogWarning(_("Warning: attempt to remove HTML tag handler from empty stack."));
+        return;
+    }
     m_HandlersHash = *((wxHashTable*) first -> GetData());
     m_HandlersStack -> DeleteNode(first);
 }
diff --git a/src/html/htmlwin.cpp b/src/html/htmlwin.cpp
index c1af6ac461..31cc7feb00 100644
--- a/src/html/htmlwin.cpp
+++ b/src/html/htmlwin.cpp
@@ -27,6 +27,7 @@
 
 #include "wx/html/htmlwin.h"
 #include "wx/html/forcelnk.h"
+#include "wx/log.h"
 
 
 //-----------------------------------------------------------------------------
@@ -154,10 +155,8 @@ bool wxHtmlWindow::LoadPage(const wxString& location)
         if (f == NULL) {
             wxString err;
 
-            err.Printf(_("Unable to open requested location :\n\n%s"), WXSTRINGCAST location);
+            wxLogError(_("Unable to open requested HTML document: %s"), location.mb_str());
             m_tmpCanDrawLocks--;
-            Refresh();
-            wxMessageBox(err, "Error");
 
             SetCursor(*wxSTANDARD_CURSOR);
             return FALSE;
@@ -224,7 +223,11 @@ bool wxHtmlWindow::LoadPage(const wxString& location)
 bool wxHtmlWindow::ScrollToAnchor(const wxString& anchor)
 {
     const wxHtmlCell *c = m_Cell -> Find(wxHTML_COND_ISANCHOR, &anchor);
-    if (!c) return FALSE;
+    if (!c)
+    {
+        wxLogWarning(_("HTML anchor %s does not exist."), anchor.mb_str());
+        return FALSE;
+    }
     else {
         int y;
 
@@ -474,11 +477,11 @@ void wxHtmlWindow::OnKeyDown(wxKeyEvent& event)
     switch (event.KeyCode()) {
         case WXK_PAGEUP :
         case WXK_PRIOR :
-                Scroll(-1, sty - (2 * cliy / 3));
+                Scroll(-1, sty - (5 * cliy / 6));
                 break;
         case WXK_PAGEDOWN :
         case WXK_NEXT :
-                Scroll(-1, sty + (2 * cliy / 3));
+                Scroll(-1, sty + (5 * cliy / 6));
                 break;
         case WXK_HOME :
                 Scroll(-1, 0);
diff --git a/src/html/winpars.cpp b/src/html/winpars.cpp
index 2148fa371e..4681967547 100644
--- a/src/html/winpars.cpp
+++ b/src/html/winpars.cpp
@@ -29,6 +29,7 @@
 #include "wx/html/winpars.h"
 #include "wx/html/htmlwin.h"
 #include "wx/fontmap.h"
+#include "wx/log.h"
 
 
 //-----------------------------------------------------------------------------
@@ -353,6 +354,8 @@ void wxHtmlWinParser::SetInputEncoding(wxFontEncoding enc)
                                       wxFONTENCODING_ISO8859_1 : m_OutputEnc,
                            wxCONVERT_SUBSTITUTE))  
     { // total failture :-(
+        wxLogError(_("Failed to display HTML document in %s encoding"), 
+	           wxFontMapper::GetEncodingName(enc).mb_str());
         m_InputEnc = m_OutputEnc = wxFONTENCODING_DEFAULT;
         delete m_EncConv;
         m_EncConv = NULL;