problem about dispaly perldoc info in vim

i try to write a key map,it's function is when the cursor on the
word,and i hit F2,the vim will open a new window on top ,and dispaly
the info about ' perldoc "keyword"'

so i write the follow sentence

map <F2> :let w="<cword>"<CR>:top new "help"<CR>:1! perldoc -t w<CR>

but no perldoc info display in new window,i do not know how to do to
let it work,any one can help?

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