var jqXHR = $.ajax( url [,settings] )
var jqXHR = $.ajax( [settings] )
jqXHR.done(function( data, textStatus, jqXHR ) {});
jqXHR.fail(function( jqXHR, textStatus, errorThrown ) {});
jqXHR.always(function( jqXHR ) {});
ParameterDetailsurlSpecifies the URL to which the request will be sent...