jquery isn't working properly when an iframe is present.

Question

I'm developing a simple jQuery shopping cart and have a message box fade in when the item has been added correctly.

$("#results_info").html(''); 
$("#results_info").fadeIn();
$("#results_info").html(data);
setTimeout(function() { $("#results_info").fadeOut(); }, 5000); 

If I have an iframe on this page. I have to hover over the iframe object before the fade will happen... not sure why?

Any ideas?