window.open & RegisterClientScriptBlock

Hi,

I have an ASP .NET (1.1) page in C# with a Text Box and a button. The user enters some HTML code into the text box and presses the button for a preview. The server side code saves the entered HTML to an *.htm file and uses RegisterClientScriptBlock to have the client browser open the preview file in a new window.

private void btnPreview_Click(object sender, System.EventArgs e)
{
   string               html         = "";
   string               filename      = "";
   System.IO.StreamWriter   streamWriter   = null;

   html   = this.txtScript.Text; // This is the text box in which the user entered some HTML code

   try
   {
      filename   = this.Server.MapPath("ScriptPreview.htm");

      streamWriter   = System.IO.File.CreateText(filename);
      streamWriter.Write(html);
      streamWriter.Close();

      this.RegisterClientScriptBlock("Preview", "<SCRIPT LANGUAGE=\"javascript\">window.open(\"Preview.htm\");</SCRIPT>");
   }
   catch
   {
   }
}

I know the code works because when viewing the HTML source of the resulting page, the newly inserted script is visible but has no effect and no window is opened.

Any ideas?

Thanks,

Khan