diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index 2e7bc632ab..fe34532cd3 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -16,6 +16,17 @@
    The license applies to all entries newer than 2009-04-28.
 */
 
+2012-05-08 16:04 UTC-0800 Pritpal Bedi (bedipritpal@hotmail.com)
+  * contrib/hbqt/qtwebkit/qth/QWebFrame.qth
+  * contrib/hbqt/qtwebkit/qth/QWebHistoryItem.qth
+  * contrib/hbqt/qtwebkit/qth/QWebHitTestResult.qth
+  * contrib/hbqt/qtwebkit/qth/QWebPage.qth
+  * contrib/hbqt/qtwebkit/qth/QWebPluginFactory.qth
+  * contrib/hbqt/qtwebkit/qth/QWebSecurityOrigin.qth
+  * contrib/hbqt/qtwebkit/qth/QWebView.qth
+    - Replaced: HB_ISOBJECT() => hbqt_par_isDerivedFrom()
+    * Rationalized: constructors.
+
 2012-05-08 15:14 UTC-0800 Pritpal Bedi (bedipritpal@hotmail.com)
   * contrib/hbqt/qtnetwork/qth/QFtp.qth
   * contrib/hbqt/qtnetwork/qth/QHttp.qth
diff --git a/harbour/contrib/hbqt/qtwebkit/qth/QWebFrame.qth b/harbour/contrib/hbqt/qtwebkit/qth/QWebFrame.qth
index 19f72b7103..46594ab4f3 100644
--- a/harbour/contrib/hbqt/qtwebkit/qth/QWebFrame.qth
+++ b/harbour/contrib/hbqt/qtwebkit/qth/QWebFrame.qth
@@ -31,7 +31,7 @@ folder   = qtwebkit
  */
 HB_FUNC( QT_QWEBFRAME )
 {
-   // __HB_RETPTRGC__( new QWebFrame() );
+   //__HB_RETPTRGC__( new QWebFrame() );
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtwebkit/qth/QWebHistoryItem.qth b/harbour/contrib/hbqt/qtwebkit/qth/QWebHistoryItem.qth
index c9f0a1551d..b77ecf40a7 100644
--- a/harbour/contrib/hbqt/qtwebkit/qth/QWebHistoryItem.qth
+++ b/harbour/contrib/hbqt/qtwebkit/qth/QWebHistoryItem.qth
@@ -32,10 +32,14 @@ folder   = qtwebkit
  */
 HB_FUNC( QT_QWEBHISTORYITEM )
 {
-   if( hb_pcount() == 1 && HB_ISPOINTER( 1 ) )
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QWEBHISTORYITEM" ) )
    {
       __HB_RETPTRGC__( new QWebHistoryItem( *hbqt_par_QWebHistoryItem( 1 ) ) );
    }
+   else 
+   {   
+      hb_errRT_BASE( EG_ARG, 9999, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
+   }   
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtwebkit/qth/QWebHitTestResult.qth b/harbour/contrib/hbqt/qtwebkit/qth/QWebHitTestResult.qth
index e6ea67596e..692b92f6f0 100644
--- a/harbour/contrib/hbqt/qtwebkit/qth/QWebHitTestResult.qth
+++ b/harbour/contrib/hbqt/qtwebkit/qth/QWebHitTestResult.qth
@@ -32,7 +32,14 @@ folder   = qtwebkit
  */
 HB_FUNC( QT_QWEBHITTESTRESULT )
 {
-   __HB_RETPTRGC__( new QWebHitTestResult() );
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QWEBHITTESTRESULT" ) )
+   {
+      __HB_RETPTRGC__( new QWebHitTestResult( *hbqt_par_QWebHitTestResult( 1 ) ) );
+   }
+   else
+   {   
+      __HB_RETPTRGC__( new QWebHitTestResult() );
+   }   
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtwebkit/qth/QWebPage.qth b/harbour/contrib/hbqt/qtwebkit/qth/QWebPage.qth
index 6bfa28df5f..80abc5d3d4 100644
--- a/harbour/contrib/hbqt/qtwebkit/qth/QWebPage.qth
+++ b/harbour/contrib/hbqt/qtwebkit/qth/QWebPage.qth
@@ -30,7 +30,14 @@ folder   = qtwebkit
  */
 HB_FUNC( QT_QWEBPAGE )
 {
-   __HB_RETPTRGC__( new QWebPage( hbqt_par_QWidget( 2 ) ) );
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QOBJECT" ) )
+   {
+      __HB_RETPTRGC__( new QWebPage( hbqt_par_QObject( 1 ) ) );
+   }   
+   else
+   {
+      __HB_RETPTRGC__( new QWebPage() );
+   }   
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtwebkit/qth/QWebPluginFactory.qth b/harbour/contrib/hbqt/qtwebkit/qth/QWebPluginFactory.qth
index 632c575b4b..ba01abdc9e 100644
--- a/harbour/contrib/hbqt/qtwebkit/qth/QWebPluginFactory.qth
+++ b/harbour/contrib/hbqt/qtwebkit/qth/QWebPluginFactory.qth
@@ -15,8 +15,9 @@
 Inherits = QObject
 Type     = Core
 New      =
-folder   = qtwebkit
+Destructor = no
 Constructor = no
+folder   = qtwebkit
 </CLASS>
 
 <CODE>
diff --git a/harbour/contrib/hbqt/qtwebkit/qth/QWebSecurityOrigin.qth b/harbour/contrib/hbqt/qtwebkit/qth/QWebSecurityOrigin.qth
index 6c061f5f56..89583e80b3 100644
--- a/harbour/contrib/hbqt/qtwebkit/qth/QWebSecurityOrigin.qth
+++ b/harbour/contrib/hbqt/qtwebkit/qth/QWebSecurityOrigin.qth
@@ -29,10 +29,14 @@ folder   = qtwebkit
  */
 HB_FUNC( QT_QWEBSECURITYORIGIN )
 {
-   if( hb_pcount() == 1 && HB_ISPOINTER( 1 ) )
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QWEBSECURITYORIGIN" ) )
    {
       __HB_RETPTRGC__( new QWebSecurityOrigin( *hbqt_par_QWebSecurityOrigin( 1 ) ) );
    }
+   else 
+   {   
+      hb_errRT_BASE( EG_ARG, 9999, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
+   }   
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtwebkit/qth/QWebView.qth b/harbour/contrib/hbqt/qtwebkit/qth/QWebView.qth
index e88d46e916..375d4d8b5f 100644
--- a/harbour/contrib/hbqt/qtwebkit/qth/QWebView.qth
+++ b/harbour/contrib/hbqt/qtwebkit/qth/QWebView.qth
@@ -12,6 +12,7 @@
  */
 
 <CLASS>
+QObject  = Yes
 Inherit  = QWidget
 New      = pParent
 folder   = qtwebkit
@@ -29,7 +30,14 @@ folder   = qtwebkit
  */
 HB_FUNC( QT_QWEBVIEW )
 {
-   __HB_RETPTRGC__( new QWebView( hbqt_par_QWidget( 1 ) ) );
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QWIDGET" ) )
+   {
+      __HB_RETPTRGC__( new QWebView( hbqt_par_QWidget( 1 ) ) );
+   }   
+   else
+   {
+      __HB_RETPTRGC__( new QWebView() );
+   }   
 }
 </CODE>