How to protect comments spamming in site

[GoogleCodeExporter]

i have this site http://www.dailynewz.net/ applied captcha for comments system 
but receiving too many spamming comments. tell me solution for this. 

Original issue reported on code.google.com by shugalme...@gmail.com on 4 Jan 2012 at 3:56

[GoogleCodeExporter]

does it is a goTube issue ?
does google code is a forum ?

no

Original comment by biscotte...@gmail.com on 4 Jan 2012 at 4:04

• Changed state: Invalid

[GoogleCodeExporter]

i am asking for some secure comment system script

Original comment by shugalme...@gmail.com on 4 Jan 2012 at 4:18

[GoogleCodeExporter]

http://www.google.com/recaptcha

no more post if it's not related to gotube, thank you.

Original comment by biscotte...@gmail.com on 4 Jan 2012 at 4:24

[GoogleCodeExporter]

thank you

Original comment by shugalme...@gmail.com on 4 Jan 2012 at 4:32