Thank you.
As it says here
http://www.inicom.net/forum/showthread.php?t=3419 I already broke the size barrier for the banner, I did try but I failed.
That mng format sound promising and I will look into it but no software I have at the moment supports that format.
The flash format I have done one and it as reduced the size by half keeping the quality but unfortunatly thats one format it's not alowed.