Adsense and Javascript

Greetings,

I am trying to make a Google Adsense ad collapsible if there are no ads available. I need to know how to access the DIV above the adsense code and set the display to none. This is what I have tried below...

Website Reference: Long Island Insurance - The ad to the right of the about us section usually is empty and needs to collapse.

<cfif #SHOW_ADSENSE# EQ 1>
                    
    <div class="floatAdRight3">

    <script type="text/javascript"><!--
    google_ad_client = "MY_PUB_ID";
    /* BUSINESS ABOUT US */
    google_ad_slot = "AD_SLOT_ID";
    google_ad_width = 120;
    google_ad_height = 90;
    //-->
    </script>
                          
    <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>
                                            
    </div>
                      
</cfif>   
      

Code (markup):

Here is the javascript code that Google calls when no ads are available:

var w = window;

if (w.parent.document.getElementsByName) 
{
    var google_ad_frames = w.parent.document.getElementsByName("google_ads_frame");
  
    for (var i = 0; i < google_ad_frames.length; i++) 
    {
        var f = google_ad_frames[i];

        if (f.contentDocument) 
        {
            if (w.document == f.contentDocument) 
            {
                f.height = f.width = 0;
                f.style.display="none";
            }
        } 
        else if (f.contentWindow) 
        {
            if (w == f.contentWindow) 
            {
                f.height = f.width = 0;
                f.style.display="none";
            }
        } 
    }
}

Code (markup):

The ad space is not collapsing correctly. Any suggestions are most welcome. Is there a way to access the correct DIV without setting ID numbers?

Sincerely,
Travis Walters