how do i overlay black lines like on this following image?

[jeeheoncho]

http://themeforest.net/item/stereoclub-nightclub-html-template/full_screen_preview/5455575[1]
the above background photo has those lines over the photo to soften the image's presence as a background photo. how do i do that?

thanks!

 

[IamSam]

Hi, They're called TV scan lines, here is a page full of TUTORIALS on the subject!

 

[jeeheoncho]

perfect, thank you!