Expandable ad script using jquery

I have an expandable ad script using jquery now in use. It uses three images - one with an "open" indicator, one with a "close" indicator, and a larger ad image. On loading it shows the ad for a designated time (now set to 2 seconds) and then closes it, allowing the reader the choice to then open the ad (or not).

It works, but I would like to add an option for it to not auto show the ad initially. If I set the code to zero seconds, it still briefly shows the ad, in a manner that is likely annoying to a site visitor. How can I change the script to not auto show the ad, but still have the open-close options?

Here is the script in use: http://towndock.net

Here is the script:

Code:

---

<script type="text/javascript">
jQuery().ready(function(){


        jQuery('.ad_close a').click(function() {
                jQuery('.ad_full').slideUp(function() {
                jQuery('.ad_close').hide();
                jQuery('.ad_view').show();
                }).hide();
                return false;
        });
       
       
        jQuery('.ad_view a').click(function() {
                jQuery('.ad_close').show();
                jQuery('.ad_view').hide();
                jQuery('.ad_full').slideDown().show();
                return false;
        });
       

});

function close_ad() {
        $('.ad_close a').click();
}
setTimeout("close_ad()",2000);
</script>

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Here is the associated html:

Code:

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<div id="ad_wrapper" style="text-align:center;">
                <div class="ad_view">
<a href=""><img src="http://towndock.net/img/11722.gif" width="928" height="30" /></a>
                </div>
               
                <div class="ad_close">
<a href=""><img src="http://towndock.net/img/11721.gif" width="928" height="30" /></a>
                </div>
               
                <div class="ad_full">
                <a href="http://www.orientalboatshow.com"_blank"><img src="http://towndock.net/img/11718.gif" width="928" height="200" alt="Come to the boat show" /></a>
                </div>

</div>

---