The way you know if they are red or blue...
var/tmp/red=null
var/tmp/blue=null
mob/Login()
if(!red)
red=src
src << "You are now Red."
else
if(!blue)
blue=src
src << "You are now Blue."
else
src << "Sorry, all player slots are already full."
del src
..()
lol to much phpbb
i dont know why you want to use images for this ...
the code i added is UNtested and some of it maybe wrong (if not all of it)
you will also need to sort the tabing out