problem with xfree 4.4

hi does the xfree 4.4 config file are in folder: /usr/X11R6/lib/X11? since i use xfree 4.4 not all my mouse button work will with imwheel... i modified the file XF86Config.98 XF86Config.eg Identifier "Mouse1" Driver "mouse" Option "Buttons" "7" Option "ZAxisMapping" "4 5" Option "Protocol" "ExplorerPS/2" .... and in xinitrc ( /usr/X11R6/lib/X11/xinit) i have xmodmap -e "pointer = 1 2 3 6 7 4 5" imwheel -p -k -b "67" my two button on the side of my mouse don't work.... before i could do: back and forward in brownser with it... but now nothing.... with xev the side button of my mouse are not recognize... any idea? http://pages.infinit.net/borland