Hi, I have PHPNUKE 7.9, and XPMidnight as a theme, but I can't see my banners of the Advertising Module. I've tried to edit the header in theme.php but I've always get errors. Can you help me?

As far as I know, I have to put this code in the header:
echo ads(0);

When i use the code in the header, the best I've done is to put the banner on top of the page, on the center, but I want to display the banner on the top left side, next to the logo.