How to open a new tab with the same current directory in a terminal?

Question

I use the following script to open a new terminal with the same pwd.
I'm wondering how to modify it to open a new tab with the same pwd.
#!/bin/sh
# Open a new terminal in the cwd
CWD=`pwd`
osascript<<END
set thePath to "$CWD"
set myPath to (POSIX file thePath as alias)
try
tell application "Terminal"
activate
do script with command "cd \"" & thePath & "\""
end tell
end try
END

Answer 1

bit of a hack, but the make command doesn't seem to work for tabs in terminal. replace what's currently in the 'try' block with this code:
tell application "Terminal" to activate
tell application "System Events"
tell process "Terminal"
keystroke "t" using command down
end tell
end tell
tell application "Terminal"
do script "cd " & (quoted form of thePath) in last tab of window 1
end tell