getElementByClass().setAttribute doesn't work

Posted by Syom on Stack Overflow See other posts from Stack Overflow or by Syom
Published on 2010-04-02T09:22:43Z Indexed on 2010/04/02 9:33 UTC
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JavaScript

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html

why when i write

document.getElementByClass('home1').setAttribute('style', 'background-image:url(img/red_menu.PNG);');

it doesn't work? i have the element with class="home1"

with document.getElementById('home1')... works fine thanks

EDIT:

and when i wrote

document.getElementByClassName('home1').setAttribute, 
i have a javascript error

Error: document.getElementsByClassName("home1").setAttribute is not a function

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