HTML :
<div id="container">
<div id="background">
   Here you are invited to add the swf embed details
</div>

<div id="content">
  Here you can add the html content
</div>
</div>
=======================
CSS:
#container{
height: 400px;
width: 500px;
position: relative;
}
#background{
z-index: 1;
position: absolute;
}
#content{
z-index: 2;
position: relative;
}

HHTML :
<div id="container">
<div id="background">
   Here you are invited to add the swf embed details
</div>

<div id="content">
  Here you can add the html content
</div>
</div>
=======================
CSS:
#container{
height: 400px;
width: 500px;
position: relative;
}
#background{
z-index: 1;
position: absolute;
}
#content{
z-index: 2;
position: relative;
}

HHTML :
<div id="container">
<div id="background">
   Here you are invited to add the swf embed detailsswf embed
</div>

<div id="content">
  Here you can add the html content
</div>
</div>
=======================
CSS:
#container{
height: 400px;
width: 500px;
position: relative;
}
#background{
z-index: 1;
position: absolute;
}
#content{
z-index: 2;
position: relative;
}

HHTML :
<div id="container">
<div id="background">
   Ajouter ici les détails du swf embed
</div>

<div id="content">
  Ajouter ici le contenu HTML
</div>
</div>
=======================
CSS:
#container{
height: 400px;
width: 500px;
position: relative;
}
#background{
z-index: 1;
position: absolute;
}
#content{
z-index: 2;
position: relative;
}

http://codamaniacs.com/html-xhtml/ajouter-background-flash-page-html.html

Add flash background to a web page

css, flash, background

CSS