RSVP

<html>
<head>
<script type="text/javascript">
function show_confirm()
{
var r=confirm("Wedding RSVP!");
if (r==true)
  {
  alert("Of course we'll be there!");
  }
else
  {
  alert("Hahah just kidding, we're totally there!");
  }
}
</script>
</head>
<body>

<input type="button" onclick="show_confirm()" value="RSVP Response." />

</body>
</html>