javascript - Setting a the background image of a div from an array -

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i have make div , set background image array of images, , make 2 buttons change picture next image in array, or previous image of array. i've been looking around stackoverflow , w3 schools, don't know why it's not working. 

var backgroundimage = new array(); backgroundimage[0] = "np.jpg"; backgroundimage[1] = "putin.png"; backgroundimage[2] = "fob.jpg";  function nextimage() var img = document.getelementbyid(element); for(var = 0; < backgroundimage.length;i++)     for(var = 0; < backgroundimage.length;i++) {         document.getelementbyid(element).src = [0].src;         document.style.backgroundimage="url(backgroundimage[0])";     }

you not evaluating array, creating literal want

 document.style.backgroundimage="url(" + backgroundimage[0] + ")";

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