Desktop Air 3.2 AS3 Clear Cookies HTMLLoader

I don´t know how to clear cookies from a HMTLLoader object. My application opens a login third part website and detect if you logged in successfuly. Here is when the third part website creates the cookies, but I have not idea how to clear or delete this cookie when the user log out the tool.

Thanks for your help!

Here is my code:

import flash.html.HTMLLoader;
import flash.events.Event;  
import flash.net.URLLoader;
import flash.net.URLRequest;
import flash.net.URLRequestHeader;
import flash.net.URLRequestMethod;
import flash.net.URLVariables;  

var myHtml:HTMLLoader=newHTMLLoader();
var requests:URLRequest=newURLRequest("login url");
myHtml.width = stage.stageWidth;
myHtml.height = stage.stageHeight;
myHtml.load(newURLRequest("login url"));
myHtml.addEventListener(Event.LOCATION_CHANGE, read_request);  

function read_request(evt:Event):void{
 var loader =newURLLoader();
 configureListeners(loader);  
 requests.method =URLRequestMethod.POST;
 loader.load(requests);  
}...