Hack MY site

Hello, i have few sites that always get strange codes added to them in which anti viurs report as virus, and this added codes couse slowing down and redirection to other sites. this means someone is hacking my sites, and add these codes, sql enjection or what ever way i do not know, but i want YOU to find out how he do it, and every time i delete the extra codes, after some times it come again. for more details please see this posting [login to view URL] many said they can do it, but everyone told different cause. so best solution is this: right now i cleaned the extra codes, so, please go hack my site ( its my site do not worry and i permit you to do it ) BUT please do NOT delete anything, just put your GAF id somewhere and give me a link to it. who do this get the project to show me 1- how he did it? 2- how to stop it from happneing again, and fix the entry whole. here is the site [login to view URL] , please do NOT damage, also bid low if you want a poof that its mine i can provide you. thanks,