Well i got kinda a problem. My screen res is 1024x768 and on my forum i have a 1000px width banner. It looks okay for me as its full size but for a bigger screen res it looks crummy. I don't want to change the width of the banner because then it would stretch my screen. Is there a way i can repeat a cut on the banner so it would repeat for a bigger screen res but not stretch a smaller screen res?

Yes there is...

use this code:

<style>
.welcome {
background-image: url('URL');
background-repeat: repeat-x;
}
</style>