Sorry, missunderstood, you cannot pass parameters in ftp.
But you can dynamically create ftp script in .bat before running ftp like

Code:
echo off
echo " preparing ftp script"
echo open 192.168.0.71 >c:\ftp\build_files.cmd
echo wlserver >>c:\ftp\build_files.cmd
echo password >>c:\ftp\build_files.cmd
echo ascii >>c:\ftp\build_files.cmd
echo cd /export/wlserver/kaolin/build/%1 >>c:\ftp\build_files.cmd
echo lcd c:\ftp >>c:\ftp\build_files.cmd
echo mget masselectric_gw.war >>c:\ftp\build_files.cmd
echo quit >>c:\ftp\build_files.cmd
echo " starting ftp process"
ftp -s:c:\ftp\build_files.cmd -i -d
echo "process complete"
echo on