[flexcoders] get source from an updated file

[cholid cholid]

Hi all
<mx:VideoDisplay id="myVid" 
            width="640" height="480"  
            source="/070520101630.flv" autoPlay="false"/>

at the code, the source is an updated video on database 
070520101630 its mean date and time when video saved
how we call the source for the next updated video?
for the example the next video is 070520101700.flv