Malicious links

Hi!
I have been hacked by malicious code that is redirecting the users first to a survey/pollings/ratings site and then to a site called “txthotties”.
I know there are many topics about people being hacked and I′ve already read those posts and also sites on WordPress, for example “Help I′ve been hacked” etc, but I′m wondering where I can find the hacked code? Until I find the malicious code, I can′t reinstall WordPress because the hacked code will be the same as before. I have looked in my .htcacess file, wp-blog-header, my css, index.php, header.php, footer.php and all my uploaded files but I havent found anyting. I have also looked in some of my plugin files. I have used online programs to search for malware and I have also downloaded the whole folder from my FTP and searched for virus locally, but didnt find anything. I have also logged in to my database, but couldnt find anything suspicious.
Can I in some other way search for the hacked code?
My website is randigaugglan.se.
Thanks a lot!
/ Katarina