Gotta agree that the banner positioning sucks! If you want to be able to stack them and then be able to move them around a bit try this:
Go to--
AdminCP>Styles & Templates>Style Manager>Edit Templates>CSS Templates>additional.css
In there copy this code:
Code:
.ad_global_header {
float:right;
position:absolute;
right:35px;
top:75px;
}
That will create an invisible box in your header to put your banners. You can adjust the position of the box once your banners are in there by changing the amount of pixels in the "Right" and "top" portions of the code.
To add your banners to the box you need to go to:
AdminCP>Styles & Templates>Style Manager>Edit Templates>Ad Location Templates>ad_global_header2
In here is where you will add your links. For static images you can just add something like this(obviously substitute your info):
Code:
[URL="[URL]http://www.quackit.com/pix/worlds_largest_rabbit_2.jpg[/URL]"]
[IMG][URL]http://www.quackit.com/pix/worlds_largest_rabbit_2_t.jpg[/URL][/IMG]
[/URL]
you can also add a script in this location to put your rotating banner.