<script type="text/javascript">
//<![CDATA[

var a = [1,2,4,5,7], b = [1,2,3,9];

document.write(
	"A = ", a, "<br />B = ", b, "<br /><br />",
	"diff(A, B) = ", diff(a, b), "<br />",
	"diff(B, A) = ", diff(b, a)
);

//]]>
</script>