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var d = new Date();
var t = d.getTime();
var days = Math.floor(t / (86400000));
2) put your images in an array
var imagearray = new Array('image1.jpg','image2.jpg'...);
3) use the MOD operator (%) to find the remainder when you divide days by the number of images in the array.
var i = days % imagearray.length;
4) then show the image corresponding to that value.
var img = new Image();
img.src = imagearray[i];
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