if you ensure that the first link is to next html file on each html file, then calibre gives no error on page order. (On my book I put an 1*1 white image file with links to following page on the top of each page. Outcome was awesome. (I'm aware of the dates. This is for the future reference)
ie:
Code:
<body topmargin="0" >
<div align="center"><center>
<table border="0" cellspacing="1" >
<tr>
<td valign="top"><a href="1569.htm" target="_self"><img src="../images/b42.gif" border="0" width="1" height="1"></a></td>
</tr>
</table>
</center></div>
<p>........
in this case 1569.htm is the next page and b42.gif is a blank gif image