Webmaster Forum / Flash / Flash Site Design / September 2007

I want to have my SWF be centered on the host HTML page both horizontally and
vertically.  I've got it to center horizontal, but can't get it vertically.  
Below is the tag I use in a CSS to try and center.  It will center horizontal,
like I said, but that's it.

margin-left: auto;
    width:800px;
    height:400px;
    margin-right:auto;
    margin-top:auto;
    margin-bottom:auto;
    height:100%;
    clear:left;