<smil>
 <head>
   <layout type="text/smil-basic-layout">
     <region id="c0"
              top="0"
              left="0"
              height="75"
              width="250"
              z-index="0" 
     />
     <region id="c1"
              top="0"
              left="0"
              height="98"
              width="97"
              z-index="1"
      />
   </layout>
  </head>
  <body>
    <par>
       <img id="i1"
            src="http://smil.nist.gov/interop1/choose.jpg"
            region="c0"
       />
       <img id="i2"
            src="http://smil.nist.gov/interop1/getout.jpg"
            region="c1"
            begin="2s"
       />
    </par>
  </body>
</smil>