loading jquery breaks the display in ie7

loading jquery breaks the display in ie7

hey guys, i'm totally new to website developing.
trying to build a site for some friends and i have this problem:

i wanna use jquery for some effects but as soon as i load it with
  1. <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
it breaks my design in ie7..

the border grows larger than the page..

strange thing: if i zoom in or out and then back to100%, to design is fixed...

any ideas how i could fix this?