error while vim script variable pass to cscope cmd

hi, I met a problem when debugging my first vim script.

the project is filled with codes like this:
struct ngx_pool_s
{
....
};
typdef struct ngx_pool_s ngx_pool_t;

ngx_pool_t *p;

so, if cursor is under ngx_pool_t, my script is expected to jump directly to
the definition of ngx_pool_s instead of the "typedef" line.

my script is: (it has a problem when passing variable to cscope, please help
me.)

"function:
"move cursor to ngx_pool_t and press shift+F
"we can goto the defition of ngx_pool_s

function! Dachuan_nginx()
let w = expand("<cword>")
if -1 == match(w, '_t$')
return
endif
let w = substitute(w, '_t$', '_s', "g")

cs find g <C-R>=substitute(expand("<cword>", '_t$', '_s', "g")<CR><CR>
"cs find g <C-R>=substitute(w, '_t$', '_s', "g")<CR><CR>
"cs find g w (I CAN'T USE VARIABLE w DIRECTLY HERE, HOW TO DO IT?)
endfunction

nmap F :call Dachuan_nginx()<CR>

and by the way, I have already solve this problem using another method,
nmap F :cs find g <C-R>=substitute(expand("<cword>"),'_t$', '_s',
"g")<CR><CR>
but I still want to know the previous problem for future use.

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