[Genome] Custom Track Issue

[Malachi Griffith]

Hi,
 
I have a problem with the behavior of my custom tracks.  I load a custom
track from a web accessible location on our web server by pointing to it
in a tailored URL.  
 
This works great, except that when I load a different custom track file
with tracks that have different names, the old tracks remain present as
blank tracks (they take up space).  To get rid of these tracks I have to
clear by session cookie.  
 
Is there some way to load a series of tracks from a file and explicitly
force the browser to show only these tracks, not every track I have
viewed during the current session??
 
Cheers,
 
Malachi Griffith
Genome Sciences Centre
Vancouver, BC
Canada