<unloadSWF>
Examples:
<unloadSWF delay="0" time="NA" mode="target"
name="DANCER" />
<unloadSWF delay="Plus20" time="NA" mode="target"
name="NewYorkStateMap" />
<unloadSWF delay="0" time="15:17:20" mode="level"
name="23" />
Behavior:
Every swfml statement has the delay and time attributes. If none are present
the default delay is "0" and
the time default is "NA", which results in immediate execution.