Creating a bucket with only first page visits

I'm trying to use Btbuckets to show a modal box to all new subscribers, only on the first page they visit. I don't want to show it on subsequent page views (or to returning visitors). That would be hidious to the visitor experience. I have tried to make this work, but with no succes.

I have tried to make a bucket with these settings:

Viewed a page at least 0 time(s) containing / in the Address
and not
Viewed a page at least 1 time(s) containing / in the Address

It doesn't work.

I guess I could create a 'hack' creating two new targets with these settings:

Viewed a page at least 1 time(s) containing / in the Address

And fill these with an html comments (opening and closing tags) to comment out the modal box section of the code. Like this:

span class="start-tag">script type="text/javascript">

$BTB.execCallback("comment-begin");

$BTB.execCallback("modalbox");

$BTB.execCallback("comment-end");

</script>

This results in the 'modalbox' target being called on the first visit. And on subsequent visits it results in:

span class="start-tag">script type="text/javascript">

<!--

(Modalbox code)

-->

</script>

Commenting out the modalbox. It works. But is a ugly workaround.

I hope anyone can help me with a better solution.

Daan Walraven.