Inserting into a textbox when clicking a button

[oddball]

Have put some code in that allows a site administrator to upload an image. I would like to modify the button click subroutine so that it will insert the <img src=&quot;....&quot; /> code for the uploaded image at the point where the cursor is in a text box:

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Sub Upload_Click(ByVal sender As Object, ByVal e As EventArgs)

Dim strFileName As String

' Proceed only if a file has been specified
strFileName = System.IO.Path.GetFileName(UploadedFile.PostedFile.FileName)
UploadedFile.PostedFile.SaveAs(Server.MapPath(&quot;/Portal/images/&quot + strFileName)

End Sub
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How's it done????

cheers,

si