undefined error.

this is the output that I am getting.

undefined5/12/2004

Code:
<script type=”text/javascript”>
<!–
now = new Date();
function RushOrder() {
var d=new Date(1000 * 60 * 60 * 4 + now.getTime());
var s;
s += (d.getMonth() + 1) + “/”;
s += d.getDate() + “/”;
s += d.getYear();
alert(s);
}
//–>
</script>

any ideas?

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