wordpress - Targetting the background of a div for a jquery parrallax scroller -

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i'm trying edit wordpress plugin targets background image of body makes scroll page. code plugin quoted below.

i want same effect target background images of other divs can't work using 

$(".class").style.backgroundposition = "0px " + (0 -              (math.max(document.documentelement.scrolltop,               document.body.scrolltop) / 4)) + "px";

but not working. i've tried use dom path target div document.div.class.style.backgroundposition = .....

can shed light on why isn't working?

    $(window).scroll(function () {       document.body.style.backgroundposition =           "0px " +              (0 -                 (math.max(document.documentelement.scrolltop, document.body.scrolltop) / 4)             ) + "px";     });


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