How to send parameters for POST request in AJAX?

hi friends,
I am sunil. I am working on ajax.
My problem is how to send post parameters in AJAX.
For GET request. I am using bleow and it is workin fine.
var url = "GetCurrencyRateController?currid="+CurrId+"&lncurrid="+LnCurrID;
For POST Requert i am sending as
var url = "GetCurrencyRateController";
req.send("currid="+CurrId+",lncurrid="+LnCurrID);
but it is not working

Check out the Apache HttpClient package and look for how to use the MultipartPostMethod.
Here is some sample code:
            HttpClient client = new HttpClient();
            MultipartPostMethod filePost = new MultipartPostMethod("http://localhost:8080/MyApp/Push");
            filePost.addParameter("subName", sub.subName);
            filePost.addParameter("serverName", sub.getServerName());
            File file = new File("C:/dataFile.zip");
            filePost.addParameter(file.getName(), file);
            int code = client.executeMethod(filePost);

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