rewrite but not rewrite everything

[Bashar]

my curent rule is
^/(.*).php /index.php?page=$1

so http://www.mysite.com/test.php    goes into->  http://www.mysite.com/index.php?page=test

now i want that

http://www.mysite.com/test.php?nr=10
to go into
http://www.mysite.com/index.php?page=test&nr=10

or http://www.mysite.com/test.php?nr=10&anything=34
to go into
http://www.mysite.com/index.php?page=test&nr=10&anything=34


thanks in advance