.htaccess Hacked

Hi,

My website get hacked, when ever some one visiting my website via any search engine it get redirected to some .ru domain, i have removed all malicious code which i have found in .htaccess file, i dont see any timthumb.php or thumb.php file in my theme still it is getting hacked in every 1 hour.

Can any one please help me in this? it is taking life now