html - background image that moves when you scroll down the page -


i keep seeing websites background image subtly moves when scroll down. nice effect i'm not sure how this? i'm experienced html, css , jquery haven't done before!

i have simple jsfiddle below need please!

many thanks,

http://jsfiddle.net/def2y2yt/

code snippet - more available using jsfiddle link

.background {     background-image: url(example.pjg);     background-repeat: no-repeat;     height: 600px;     width: 100%; }

like tylerh said, it's called parallax. can see example here.

using javascript:

var velocity = 0.5;  function update(){  var pos = $(window).scrolltop();  $('.container').each(function() {      var $element = $(this);     // subtract height b/c of padding     var height = $element.height()-18;     $(this).css('backgroundposition', '50% ' + math.round((height - pos) * velocity) +  'px');     });     };   $(window).bind('scroll', update);

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