[jQuery] $.ajax ?

[jQuery] $.ajax ?


Before I use the $.ajax function, do I need to install a codebase for
it?
I notice it is similar to Klaus Hartl cookie plugin, where I install
his codebase, then use it later like var country =
$.cookie('language');
When I start to use this code it seems almost like the rest of the
working jQuery portions of the web page stop working.
    $.ajax({
        url: "language_sheet_en.xml",
        dataType: "xml";
        success: function(xmlDocument){
            $(xmlDocument).find(...).dosomeThing(...);
        }
    });
Do I need to install an ajax library or is it allready available in
my
jQuery build: * jQuery 1.1.3.1
Thank you.