Just a quick option...  This may or may not work:

 

I assume you're using JavaScript to do the dynamic CSS changes.  From what you've said in your previous post, I assume your code looks something like this:

 

if (some condition) {

   document.getElementById('div_id').style.display = "none";

} else {

   document.getElementById('div_id').style.display = "block";

}

 

Try changing .display = "block" to .display = "".