How do i control the rendering the content in a iframe

I've been asked to integrate a clients site into ours, and we're looking to do this via an iframe - however unfourtunitly we need to overrde some of the CSS styles within the source of that iframe.

Now my requiremnt is simple i.e. I just need to append/if necessary manipulate the content of an iframe.

However i'm getting nothing but problems trying to do this i.e. if i try using javascript i get access denied e.g.

         var method1 = window.frames['uxIframe'].document;
          var iframe=document.getElementById("uxIframe");
          var method2 = iframe.contentDocument;

So my plan b was to use HttpWebResponse / request to stream the info, and this seems to work e.g. please see below... But i can't add it as the contents of an iframe, which is needed otherwise i'll get a number of JS errors?

Is there anyway around this or better yet an alternative approach?

Thanks
P

Dim request As WebRequest = WebRequest.Create("http://www.google.com/")
        ' If required by the server, set the credentials.
        request.Credentials = CredentialCache.DefaultCredentials
        ' Get the response.
        Dim response As HttpWebResponse = CType(request.GetResponse(), HttpWebResponse)
        ' Display the status.
        Console.WriteLine(response.StatusDescription)
        ' Get the stream containing content returned by the server.
        Dim dataStream As Stream = response.GetResponseStream()
        ' Open the stream using a StreamReader for easy access.
        Dim reader As New StreamReader(dataStream)
        ' Read the content.
        Dim responseFromServer As String = reader.ReadToEnd()
 
        'How do i Display the content?
        'uxIframe.InnerHtml = responseFromServer
        'uxIframe.InnerHtml = ""
        'Label1.Text = responseFromServer
        'Literal1.Controls.Add()
 
        ' Cleanup the streams and the response.
        reader.Close()
        dataStream.Close()
        response.Close()

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