how can i generate advanced keywords in per page

Hello
Dear Sirs
Please tell me how can i generate keyword in per page
for example if you go to this site: http://absolutely.net/Anna_Faris/ you can see in source cod about ( Anna Faris )
<meta name=keywords content=”absolutely Anna Faris, Anna Faris pic, Anna “>
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or if you go to this url: http://absolutely.net/Lindsay_Lohan/ you can see in source cod
<meta name=keywords content=”absolutely Lindsay Lohan, Lindsay Lohan pic,”>
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is plugin or …. for this work ?
if i can do it please tell me
thank you