vim scripting - using variables

I'm trying to integrate cscope with vim. The standard method to load the
cscope.out file is simply:

if filereadable("cscope.out")
cs add cscope.out
endif

But this requires always starting vim from the directory with the cscope.out
file. Yuk.

So, I've written a function that scans upward until if find the cscope.out
file, and stores that in a variable. For example s:csfile might end up
"../../cscope.out"

However,

cs add s:csfile

doesn't work! It is trying to actually open a file called "s:csfile". How
do I make vim translate this variable into a literal so that "cs add" will
work???

Thanks.
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