If you want to be able to call web services through an ajax call via jquery, you can use this little piece of code:
$.ajax({ url: "yourwebserviceurl", type: "GET" //the http request type, dataType: "json" //the expected data type returned by web service success: function(response) { //do something here with response object if call goes OK }, error: function() { //do something here if call goes KO } });
more informations here