how to preload a banner?

Each page in my website contains more than 10 images . My need is to preload a banner before any of these images gets loaded . If the banner was simply a .gif or .jpg file ,then i could've used preload image function , which is available on many sites .

But the code for this banner is given as follows :

now what happens is, all the images gets loaded before this banner loads, and as soon as the images r loaded, the visitor will close the window that the banner does not get viewed . I tried placing the banner code at the top of the page, that also didn't work . MY NEED IS TO LOAD THE BANNER BEFORE ANYOTHER THING GETS LOADED, BUT THE BANNER SHOULD APPEAR AT THE BOTTOM OF THE PAGE .

Please tell me how to do this . I'll be much grateful to u if u provide me with the script for doing this , since i'm not familiar with javascripts or php. Thanks .