porkupan,
you were right - modifying main.xml is the right way to do things. For those who as dummy as I am - you need to insert:
<function id="doRight">
this.bubble("doNext");
</function>
right below the lines:
<kbookPage id="PAGE" left="0" right="0" top="0" bottom="30" href="x-id://bookData">
<code>
The good tool to edit .xml files is XML Marker from
http://symbolclick.com/download.htm