CSS Background Changing

[GoldNetX]

Anyone know what the code would be to change the background on a div that has been set in CSS.

I know that

document.getElementById('img').style.

accesses the Div with the Id img, but I can't seem to find the correct syntax to change the background:url().

edit: Figures right after I ask I figure it out.

Here is the code if anyone needs it:

document.getElementById('div').style.background='url(file)';

Where div is the tag ID you want to use it on and file is the fiel you want as the background.