How to insert SWF instead of JPG with CSS

programming web dev
1

I have this style where is displaye the JPG image on the top of my page:

#zahl	{
/*
TOP image
*/
	position: relative; width:730px; height:300px; left:0; top:0;
	margin:0; padding:0; overflow:hidden;
	background:#eea405 url('nat2-top-r.jpg') no-repeat;
}

I would like to have there nat2-top-r.SWF file instead of nat2-top-r.jpg

Thanks for help