Is there a possibility to change the target information?
<a href="side2/index.html" target="_blank"> what I do need is <a href="side2/index.html" target="_self">
[Technique is this answer is no longer needed if using v2.6 or higher see this article for more details. ]
Attach the following code as a .js file in the Resources section of the in5 dialog before exporting and it will do the conversion for you:
$(function(){ $('[target]').attr('target', '_self'); });
(Demo file)