Lost html content when view source

Hi all,

Here is my problem when view source to insert

<div class="ButtonContainer">
   <a class="Button1" href="#"></a>
   <a class="Button2" href="#"></a>
</div>

Class Button1, Button2 are background images button. But when i click to view source again, in the div.ButtonContainer is nothing.

<div class="ButtonContainer">&nbsp;</div>

I guess the html processor of ck don't allow code a link is empty text???

<a class="Button1" href="#"></a>

Anyone can explain for me about this problem? Or the solution to fix this if i want to do above?

Thanks.