periodic
HTML
<div id="canvas_container"></div>
JavaScript
var paper = new Raphael(document.getElementById('canvas_container'), 1500, 1000);
var offx = 50
var offx = 50
var offy = 200
var wid = 60
var boxwid = 50
var box = [];
for (var i = 0; i < 5; i++) {
box[i] = paper.rect(offx + wid * i, offy, boxwid, boxwid)
}