[xsl] How to display the previous page number

I need to display the page number in the following format :
<previous_pageNumber> // <current_page Number>

For example:
On page 3, I need to display:
2 // 3
and on page 5
4 //5

We are using for 0.20.4 and xsl version 1.0
Thanks in advance,
Ranjitha Rao

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