How to put a different image for each page in the footer?

Hi,

I need to put in the footer a different image for each page. Each image contains the page number. I need to create the report in PDF and I must use the runandRender. The images are in the resource folder. The file name is "page" + page number + ".png"
In the footer, I put the image with the script : ".\\page" + pageNumber + ".png"
But the pageNumber doesn't work in PDF.

I use the BIRT 3.7.2.
Could you tell me if there is a solution to get the page number?

Thanks