Window Size Issue
 

If i am using full screen, everything is perfect :

http://prntscr.com/49i4gp

if i go in window mode i get this :

http://prntscr.com/49i4o1

is there any fix for this :O ?

We will not be able to help you without a direct link to your forum.

www.boomboomforums.com :)

When I go full screen with FF 32, I get what we see in the second image you posted.

And wow.... This image which you have hosted off site (3rd party) is almost 90% of your entire page load, coming in at a whopping 1.3 megabytes:

http://i61.tinypic.com/316p5bq.png

You should convert this image into a progressive jpeg and host it on your server, saving at least 1 megabyte of bandwidth. You can get the look without all the glut.

Do you know if there is a fix for the issue ?

I am not the expert in this area, graphics are not my thing, but I believe you either need to go to a fixed vbulletin layout or use a column on the left and the right, instead of a fixed graphic. This method would also cut down on the image size as @Max Taxable has already indicated. There are threads here on vBulletin.org on how to setup the HTML. (They might be a bit difficult to find.) :( If you cannot find the threads, look at a few sites and examine the source HTML -- that should give you the presentation logic that you need. :)

You might try searching for the term "graphical borders", "graphic border".

Well i tryed that already, but my editing skills are horrible
i find nothing

You need to edit the stylevar, body_padding, found under the group Global, and set the left and right to auto.

Add this to the bottom of your additional.css template. This might be what you are looking for. You still might l want to set a fixed width on your page.

Thanks @Ozzy47, I see that he posted a link, so I could check his .body-wrapper selector.