Simple JSON-RPC client for Titanium (appcelerator.com)

Can work in browser too

Usage:
var client = new JSONRPCClient('http://webservice.com/json-rpc/');
client.call('ns.method', {
    params: [1, true],
    success: function(result) {
        //result handling
    },
    error: function(err) {
        //error handling
    }
});