<smil>
  <head>
    <layout>
	<region id="r1" top="0" left="0" height="75" width="250"/>
	<region id="r2" top="75" left="0" height="98" width="250"/>
    </layout>
  </head>
  <body>
    <seq>
       <img id="i1"
            src="http://smil.nist.gov/interop1/getout.jpg"
            dur="2s"
            region="r1"
       />
       <img id="i2"
            src="http://smil.nist.gov/interop1/choose.jpg"
            dur="2s"
            begin="id(i1)(1s)"
            region="r2"
       />
    </seq>
  </body>
</smil>