First bash script - Enter root password only once

I wrote a small bash script. It needs root password. There are two commands only, both of which need the permission. So, currently I must enter the superuser password **twice** - I don't want that. I linked the script to desktop. And I'm executing it from desktop I mean. My effort, which does not work: gksu -u root "iptables -D INPUT 7 && iptables -D INPUT 6"