In Eclipse open DroidGap.java. Find the function public void onCreate(Bundle savedInstanceState). Look for the line that created the Android WebView:

appView = (WebView) findViewById(R.id.appView);

Beneath that, add these two lines:

appView.setVerticalScrollBarEnabled(false);
appView.setHorizontalScrollBarEnabled(false);

The scroll bars will no longer appear.

Since Phonegap v0.9.2 there is no need to change core DroidGap.java files.

Just change you main activity class ( the one that extends DroidGap):

public class MyApp extends DroidGap {

     @Override

     public void onCreate(Bundle savedInstanceState) {

          super.onCreate(savedInstanceState); 

          super.init();

          super.loadUrl("file:///android_asset/www/index.html");

          // Disable scrollbars 

          super.appView.setVerticalScrollBarEnabled(false);

          super.appView.setHorizontalScrollBarEnabled(false);

          // Scrollbar Overlay Content

           super.appView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);

     }

}