How can I pass http header to IIS webservice in basic authentication mode?

Hi,

I'm using Caringorm framework in my web application. The UI invokes webservice hosted in IIS. As of now I'm using windows authentication.

Authentication works perfectly in this mode.]

Now I wish to change authentication to IIS basic authentication.

Can anyone help me how can I achiev this?

Also I would like to encrypt the user credentials befor posting.

I'm trying with the below code and getting IE popups login box appearing everytime.

private function loadTranslationWSDL():void

{

    var encoder:Base64Encoder = new Base64Encoder();

    encoder.insertNewLines = false;

    encoder.encode(portalSer.strUserName + ":" + portalSer.strPassword);

    model.svcLocator.getWebService("svcCommon").httpHeaders = {AUTHORIZATION : "Basic " + encoder.toString()};

    var translationToken:AsyncToken = model.svcLocator.getWebService("svcCommon").GetPortalUserTranslations();

    translationToken.addResponder(new ItemResponder(onGetPortalUserTranslationsResult,onTranslationsFault));

}