The src for the flash is in the define_main_page
Is this entered in this file sorta like:
Code:
<div class="flash">
  If you cannot see the Flash content, you may need to update your Flash Player.
</div>

<script type="text/javascript">
   var so = new SWFObject("images/Your_flash.swf", "movie", "???", "???", "6", "#000000");
   so.write("flash");
</script>
Where you have defined this flash as being this div? If so then in the css:
Code:
.flash {
        position: relative;
        z-index: -1;
        }
Then just try making the others z-index: 1000;