diff --git a/index.html b/index.html
index 510a765..e1d8a57 100644
--- a/index.html
+++ b/index.html
@@ -1362,7 +1362,12 @@ <h1><img src="austflag.gif" alt="Aussie Flag"> <font color="#DC1B30"><font size=
 
 //Enter domain of site to search.
 // ToDo: set dynamically to avoid looking at wrong website! 
-var domainroot="www.engenia.com.au"
+//var domainroot="www.engenia.com.au" or "https://engenia.github.io/Engenia/"
+// requires different logic for sub-sites hosted on "github.io" 
+var gh-subsite = "github.io"; 
+var domainroot=window.location.hostname;
+if  (domainroot.indexOf(gh-subsite) !== -1); // true domainroot contains "github.io"
+  var domainroot=window.location.href;
 
 function Gsitesearch(curobj){curobj.q.value="site:"+domainroot+" "+curobj.qfront.value}
 </script>