George,

You will need to edit the "default-results.html."

Just comment out from around line 24 -

<script> listings = new Array ();</script>

to around line 58-

<document.write("<tr><td colspan=3><img src='http://www.searchfeed.com/Images/pixel.gif' height=4></td></tr>");
document.write("</table>");
}
</script>

I would make a backup copy first!

As far as switching back and forth, just stick in some comments and do a find and replace. Some Adsense. Some SF.

Chris