var srcDoc = app.activeDocument;
app.preferences.rulerUnits = Units.PIXELS;
var sq = 100;
var widthParam = app.activeDocument.width/sq;
var heightParam = app.activeDocument.height/sq;
var pI = 0;
var pJ = 0;
for (var j = 0; j < heightParam; ++j) {
pJ = j*sq;
for (var i = 0; i < widthParam; ++i) {
pI = i*sq;
srcDoc.selection.select(Array (Array(pI, pJ), Array(pI+sq, pJ), Array(pI+sq, pJ+sq), Array(pI, pJ+sq)), SelectionType.REPLACE, 0, false);
srcDoc.selection.copy();
var img [...]