It may be something like this in HTML:
<div class="container-outer">
<div class="container-inner">
<!-- Your images over here -->
</div>
</div>
With this stylesheet:
.container-outer { overflow: scroll; width: 500px; height: 210px; }
.container-inner { width: 10000px; }
You can even create an intelligent script to calculate the inner container width, like this one:
$(document).ready(function() {
var container_width = SINGLE_IMAGE_WIDTH * $(".container-inner a").length;
$(".container-inner").css("width", container_width);
});