1. A method, comprising: at a web service provider computer, creating a package containing: a function call corresponding to a web service provided by a web service provider; presentation information associated with the web service; and code associated with the function call; and providing the package to a client computer over a network connection, wherein the code associated with the function call corresponding to the web service assists a client web site in: providing one or more function call parameters; making the function call to the web service running on a server computer remote from the client computer, wherein the package includes information that enables the client web site to properly format input/output parameters required by the function call; and presenting results of the function call through the client web site with the presentation information associated with the web service, thereby allowing the web service provider to retain control of the presentation information associated with the web service provided through the client web site.