Setting the response header through JavaScript

Hi guys
I have to show a file to the client using the browser, I have the file contents stored in my Blob Field in the Database. Now I want to display the file on clilck of a button called DOWNLOAD and then determine the type of file, correspondingly setting the contentType and setHeader of response object. How can i do that??? Please help me at ur earliest...
Thanx

Hi,
I have created a JSP Page that will send a picture to the browser based on an ID that it is passed. Hope this helps a bit.
Gr. Arjan
<%
     String strDiscId = request.getParameter("id");
     int discId = Integer.parseInt(strDiscId);
     Disc myDisc = new Disc();
     myDisc.retrieve(discId);
     response.setContentType("image/jpeg");
     response.getOutputStream().write( myDisc.getImage() );
     response.getOutputStream().flush();
%>

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Setting the response header through JavaScript

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