using cscope with tabs

Hi all,

I am using cscope with vim and have the following mapping in my .vimrc:

nmap <C-\>s :tab cs find s <C-R>=expand("<cword>")<CR><CR>

this works fine except for the fact that it is opening a new tab every
time I use it.
I want to open a new tab only if the file does not exist in one of the
already opened tabs.
If it already exist, use this tab.
This is the normal behavior of most other IDEs.

Can someone tell me how to change the mapping?

Thanks, Roy.

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