Usa esto:
Código HTML:
<style>
#fondo{ position: absolute; z-index: 0;}
#delante{ position: absolute; z-index: 1;}
</style>
<div id="contenedor">
<div id="delante">
Aquí pones tu tabla.
</div>
<div id="fondo">
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0">
<param name="movie" value="reloj.swf" />
<param name="quality" value="high" />
<param name="wmode" value="transparent" />
<embed wmode="transparent" src="reloj.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash"></embed>
</object>
</div>
</div>