Allow multiple banners in the Advertising block

This replaces the regular Advertising block (blocks/block-Advertising.php)
since it does the same thing but also allows you to display multiple banners by setting the $numbanners to any value.
defaults to 1 banner, $numbanners=1

Tested on PHP-Nuke 6.5+
Download at
http://www.ierealtor.com/modules.php?name=Downloads&d_op=viewdownload&cid=2
(no registration required)


Developers Note: This is a more efficient use of the banner table too.
I suggest replacing the base nuke blocks/block-Advertising file with this.