You can use [L,QSA] after your rule (QSA = Query String Append)
RewriteRule ^([^/]*)/([^/]*)\.html$ /router.php?package=$1&page=$2 [L,QSA]
For example, http://example.com/bingo1/bingo2.html?param1=foo¶m2=bar¶m3=baz
will call router.php?package=bingo1&page=bingo2¶m1=foo¶m2=bar¶m3=baz