How to call a javascript function and get the html code it returns ,Java,Android

There is a HTML page that has a javascript function in it.This function returns a frame with a random picture. Is there a way to call this function and get the HTML code that is hidding? (So i get the image)

Exactly i want to get a html stream from GoogleServ开发者_如何学Goices.js by calling:

GS_googleAddAdSenseService("ca-pub-YOU
RPUBIDHERE");
  GS_googleEnableAllServices();
  GA_googleAddSlot("ca-pub-YOURPUBIDHERE", "ADSLOT_NAME_HERE");
  GA_googleFetchAds();
GA_googleFillSlot("ADSLOT_NAME_HERE");

An example of how Java and JavaScript can call each other using a WebView in Android can be found here: http://code.google.com/p/apps-for-android/source/browse/trunk/Samples/WebViewDemo/src/com/google/android/webviewdemo/WebViewDemo.java