[Xellath]

PHP Code:

switch(random_num(1,8)) 


10 cases..?

Instead of all those cases, you could just do this to get random colors.

PHP Code:

fm_set_rendering(id, kRenderFxGlowShell, random(255), random(255), random(255), kRenderNormal, 16); 


set_user_rendering from fun could be used instead, it's more efficient.

IMO you should rename the cvar to something more appropiate, like amx_randomglow, for example.

EDIT:
You shouldn't set a task in client_connect, may cause trouble. Hook spawn or new round instead.