Just put this script as high up in the head section of the page, and change the IP you want to ban. NOTE: this only works on one page, not for all your pages. This needs to go on each page you want to ban this person.

Code:
<script type="text/javascript">

ip = '<!--#echo var="REMOTE_ADDR"-->'

//separate ips with commas
 bannedips=["11.11.11.11"]

handleips=bannedips.join("|")
handleips=new RegExp(handleips, "i")

if (ip.search(handleips)!=-1){ 
alert("IP is banned on this site! Please wait...")
window.location.replace("http://www.google.com")
}

</script>


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