xinitrc follies

hi gang,

I'm trying to configure .xinitrc so I can choose which window manager to use 
on a whim, and of course there must be a default. Here is my current version:

#!/bin/sh

ARG=$1
DEFAULTWM="afterstep"

if [ ! $ARG ]; then
    ARG=$DEFAULTWM
fi

if [ $ARG = "gnome" ];then
   WM=gnome-session
elif [ $ARG = "kde" ];then
   WM=startkde
elif [ $ARG = "after" ];then
   WM=afterstep
else
   WM=$DEFAULTWM
fi

exec $WM

Running 'startx' launches the default. But when I try 'startx gnome' or 
'startx kde', it looks like X starts, then closes right away. Anything I use 
as DEFAULTWM works. Any brilliant notions?

thanks!

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Carla Schroder
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