Ideally, this should be done server-side.
However...
Code:
<script type="text/javascript">
var imgprefix = "mi",
imgsuffix = ".jpg";
var gatsu = (new Date()).getMonth() + 1;
document.writeln('<img src="' + imgprefix + gatsu + imgsuffix + '" width="740" height="120">');
</script>
For example, in this case, it would, every month, rotate:
mi1.jpg // January
mi2.jpg // February
mi3.jpg // March
...
You can also specify images in a different directory, by specifying the relative directory in imgprefix.
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