[jQuery] Safe Ajax Calls?

[jQuery] Safe Ajax Calls?


Hi!
I'm kind of new at the world of ajax and jquery and i'm starting to
make a site with them.
In my site i've created a single function (in the header) called
ajaxQry(...) which takes some parameters like, url to make post or
get, if I need GEt or POST, the data type of the query, a success
function and an error function.
Anyway, it look like this:
function ajaxQry(sendVars, url, returnType, backFunction,
errorFunction){
     $.ajax({
     type: "POST",
     url: "ajax/"+url+".asp?nocache="+Math.random(),
     data: sendVars,
     success: backFunction, //ussully this loads the content in the main
page as html
     dataType: returnType,
     error: errorFunction
    });
}
Everything works great but i don't know if there's a better way to do
this, because in many events of the site I call this function... And
I'm starting to think that it's pretty insecure.... What do you think?
By the way i ussually call the url file (see the function) and return
HTML content, and then i load it in the page with $(selector).html();
is that okay?
Thanks! and sorry for my english :$