SWF below navigation possible?

Dear all,

I’m a relative newbie when it comes to wordpress, but I’m slowly finding my feet. However I am trying to insert an swf banner below my navigation at the top of my page, and have come to a dead end. Is there a way to insert it into the header but somehow tell it to appear below the nav section? As i would like the banner to appear on every page.

Any help would be greatly appreciated,

Thanks,
Dan.