The easiest way to achieve this would be to apply a min-width
Code:
.banner {
width: 100%;
background-image: url(images/filler.png);
background-repeat: repeat;
min-width: 900px;
}
To achieve the same thing in IE6 and below though you'll need expressions as it doesn't support min-width so I'd use conditional comments and include the following
note: I'd put the include to your ie6.css stylesheet between the conditional comments so that any IE6 and below hacks are contained within one stylesheet.
Code:
<!--[if lte IE 6]>
<style type="text/css" media="screen">
.banner { width: expression((documentElement.clientWidth < 900) ? "900px" : "auto" ); }
</style>
<![endif]-->
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