Using IE6, IE7 and possibly FF older than 3.5.5 (tested on 3.0.17).

Some AJAX requests seem to come back on error with no reason (same request is working well with lib 1.3.2).

Comes back with

xhr.status=200

thrownError : undefined

$.ajax({

type: "POST",

dataType: "json",

url: "../ajnet/showme",

async: true,

data: {ad_id: this.adId},

timeout: 10000,

error: function(xhr, ajaxOptions, thrownError) {

alert(xhr.status+" : "+thrownError);

},

success: function(json){

...

}

}

});