NavigateToURL not firing when site viewed on Mac

Question

I am simply trying to link a button on my site to another webpage (an online store).  The site is currently live at http://HigdonFlorist.com.  The last 2 menu options (View Bouquets and Place Order) should link to http://store.higdonflorist.com.
On PC, this works just fine every time.
However, I have reports that Mac users have trouble.  The action never fires on the first 4 or 5 tries.  Then, suddenly, it begins to work (and continues to work thereafter).
I have scoured Google and Adobe Forums, and it seems this is not a common problem.  So I'm hoping it is just a simple fix.
My AS3:
import flash.net.URLRequest;
import flash.net.navigateToURL;
navigateToURL(new URLRequest("http://store.higdonflorist.com"), "_self");
I have also tried this method:
var url:String = "http://store.higdonflorist.com";
var request:URLRequest = new URLRequest(url);
try {
     navigateToURL(request, '_self');
} catch (e:Error) {
     trace("Error occurred!");
Thanks in advance....

Answer 1

var url:URLRequest = new URLRequest("http://store.higdonflorist.com");
navigateToURL(url, "_self");