Anyone experienced in iTextSharp?

I am using the code below to parse my HTML into a PDF Document.

However I have found that it works initially at overwriting documents as required unless I try to overwrite one with less content than the original, in these cases i suspect that redundant pages are not being deleted and that also ithe actual PDF will not open (as if it is corrupt)

Code:

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    public void GeneratePDFDoc(strText)
    {
          Document doc = new Document(PageSize.A4, 50, 50, 50, 50);
              PdfWriter writer = PdfWriter.GetInstance(doc, new FileStream(Server.MapPath(ConfigurationManager.AppSettings["PDFPath"].Trim()) +"/" + CourseCode + ".pdf", FileMode.OpenOrCreate));
     
        doc.AddDocListener(writer);
        doc.Open();




            String htmlText = strText;
              List<IElement> htmlarraylist = iTextSharp.text.html.simpleparser.HTMLWorker.ParseToList(new StringReader(htmlText), null);

          for (int k = 0; k < htmlarraylist.Count; k++)
            {
                doc.Add((IElement)htmlarraylist[k]);
            }
                     
            doc.Close();
   
    }

---

In addition to this I actually want to create the PDF from a template so rather than opening and modifying the PDF I actually just want to overwrite it completely.

I understand I need to use the stamper methods for this but dont see how I can fit in my HTML parser text.

In addition to this I also want to insert the images refered to in the HTML image tags.

Any help on what methods to use appreciated.

Update
The images problem was solved in thread http://www.vbforums.com/showthread.php?t=651424

The code below opens a template copies is and creates a new document from it and adds the html to the document.

My outstanding issue is that the template actually just holds an image like a header, when I add the additional html generated text it is added at the same place as the header rather than after.

I need to figure out where the template content ends and only add the additional content after.

Code:

---

public void GeneratePDFDoc(string htmlText)
    {

        int pageNumber = 1;
        PdfReader reader = new PdfReader(Server.MapPath(ConfigurationManager.AppSettings["PDFPath"].Trim()) + "/" +"Template.pdf");
        iTextSharp.text.Rectangle size = reader.GetPageSizeWithRotation(pageNumber);
        Document doc = new Document(size);
        PdfWriter writer = PdfWriter.GetInstance(doc, new FileStream(Server.MapPath(ConfigurationManager.AppSettings["PDFPath"].Trim()) + "/" + Code + ".pdf", FileMode.Create, FileAccess.Write));


        doc.Open();

        PdfContentByte cb = writer.DirectContent;
        doc.NewPage();
        PdfImportedPage page = writer.GetImportedPage(reader, pageNumber);
        cb.AddTemplate(page, 0, 0);

   

              String htmlText = ReturnHTMLString(htmlText);
            htmlText = RemoveHyperLinks(htmlText);
            htmlText = LocalizeImages(htmlText);
           
            List<IElement> htmlarraylist = iTextSharp.text.html.simpleparser.HTMLWorker.ParseToList(new StringReader(htmlText),null);
     
            for (int k = 0; k < htmlarraylist.Count; k++)
            {

                doc.Add((IElement)htmlarraylist[k]);
            }
           
           
            doc.Close();
   
    }

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