how to create a popup message

i wanna have a popup message to inform the user that a particular action has been done successfully and redirect them to another page.

but the popup message doesnt appear when i apply the following codes.

// more codes above

try{

Ps = Con.prepareStatement(sSQL);

Ps.executeUpdate();

System.out.println(sSQL);

Con.close();

}

catch (Exception e) {

System.err.print("Jdbc.Query(): " + e.getMessage());

}

output.println("<script language = javascript>");

output.println("alert(Added successfully);");

output.println("<script>");

String url = response.encodeRedirectURL("http://localhost:8080/....");

response.sendRedirect(url);

what's my mistake?

[766 byte] By [kacheeka] at [2007-10-2 18:24:35]