Need Help - CentOS Bukkit Server Restarter

Hi,
Like the title says, I need a server restarter do my server that's 24/7 and after 5 hours start to lag and bugging. I tried a lot of thing, one of them simple restart.
At this moment the server is reloading 1 time per hour, but i guess this is lagging more the server.
I only need help creating the start.sh to the server, becaause everytime I use while/do/done the server says it's no recozonionable.
this happens when i load with screen sh start.sh, when i load ./start.sh say that to.

Code:

#!/bin/sh
            BINDIR=$(dirname "$(readlink -fn "$0")")
            cd "\$BINDIR"
            while true
            do
                java -Xmx1024M -Xms1024M -jar craftbukkit.jar
                echo "If you want to completely stop the server process now, press Ctrl+C before the time is up!"
                echo "Rebooting in:"
                for i in 5 4 3 2 1
                do
                    echo "$i..."
                    sleep 1
                done
                echo "Rebooting now!"
            done

Thanks for helping

PS: I Need Help quickly, because i have a 24/7 server and i'm loosing people cause of this :S

help plz, i'm disapointing lots of users

EDIT by Moderator: merged posts, please use the edit button instead of double posting.