Finally some problems are fixed ... Thank you , Guys!

Now I can use gcin with skype only if I put "export GTK_IM_MODULE=gcin " and "export XMODIFIERS='@im=gcin' "

in my .profile.

Should I modify the script in  80im-switch ?

# X Input method setup script

# Keep original values related to IM
_XIM=$XIM
_XIM_PROGRAM=$XIM_PROGRAM
_XIM_ARGS=$XIM_ARGS
_XMODIFIERS=$XMODIFIERS
_GTK_IM_MODULE=$GTK_IM_MODULE
_QT_IM_MODULE=$QT_IM_MODULE

Is posible to modify this settings?

please see 80im-smitch file