Show Logo/ad While Content Loads At The Back End

I want to place a Logo/ad in front of content, there are ways to do it but the problem with them is that they use JS show/hide method. What happens is that the content doesn't load

Solution 1:

I think you can try set events for flash content to notify that content has been downloaded ( this tutorial can help you http://www.permadi.com/tutorial/flashjscommand/ ). While main contents does not receives signals from all content elements (if more than one) you can display modal window or just hide other content.