I HAVE AN IDEA !!
This is my idea:

Insted of having it all blended together, the login and the forum itself. I thought of having the login on a page for itself, after typing in the information you come in to the forum itself.

something like this :

you open the magicworld.bosnianforum.com...and come to a page with a black background, some kind of effect on the page, or a picrute of harry and his happy frinds or voldemort and harry...
In the middle you have the Username box and under is the Password box...and under that is the login button...after typing in the information and clicking "login" or just pressing the enter button on your keyboard...you come to the forum site...the Name of the forum is at the top, undet it is the menu...and under the menu is the forum itself...and it can also have a black background with a picture or effect in it. Because, black...fitts in everything, and it fitts well with all the harry potter stuff...green dose not XD

Well, hope you read this and think about it...

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P.S
I dont think its that hard to link the login page to the forum itself after typing in the information. Tho, you know HTML and all that so there will be no problems there I bet XD

Mensud it is great as far as I understand the proposal. Did you know that doing it in CSS? I am learning so we'll see.

Indeed, you can do alot with CSS and JAVA XD
tho I havnt been programing for a while now, but I do know you can do that, and its easy if you know how =3

indeed, work hard and make a good site^^

Yess my friend thy <3