All the answers I saw. were good solutions; I add just one more for the records.
Add this in the place you wish in your .xhtml file (it can be any place, even inside a paragraph or title, no matter):
Code:
<span class="pgnum">XX</span>
where XX is a number, of course, and in your .css stylesheet add the following:
Code:
.pgnum {
display: none;
}
That's all