Nemal by byt ten skript vnutri toho divu? Takto?
Kód:
<div class="header">
<div id="bannerdv"><script src="banner.js" type="text/javascript"></script></div>
</div>
Alebo potom, ak to nepojde, skus tomu divu nastavit
margin: 0 auto;...
Kód:
<style>
#bannerdv {width:676px;height:108px;overflow:hidden;text-align:center; margin: 0 auto;}
.header {width: 705px; height: 129px; background: url(images/header.gif) no-repeat; overflow:hidden;}</style>