It is not advisable to open external pages within the Cordova application itself. If you only need to open external pages, just call the device's default browser by:
navigator.app.loadUrl("seuLink", { openExternal:true } );
In the latter case, if you really need to open an internal page on your Cordova / PhoneGap App, try using iframe. However, as said, this can cause a lot of problems in the way that the App works (% events%, for example, may not work as expected).
PS: Additionally, from Cordova 4.0, the default WhiteList plugin has been implemented. You may need to configure the pages you will open in advance.
Hope it helps. :)