It's just Dynamic HTML (DHTML). If you use something like Dreamweaver you can make layers quite easily.
A basic bit of sample source would be:
<body bgcolor="#FFFFFF" text="#000000">
<div id="Layer1" style="position:absolute; left:214px; top:143px; width:319px; height:158px; z-index:1">LAYER
CONTENT GOES HERE</div>
The DIV code is the layer bit. You can include nay other HTML within the CONTENT GOES HERE BIT... including FLash embed code.
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