currentY -= 15;
float topColumn = currentY;
for (int k = 1; k < numColumns; ++k) {
float x = allColumns[k] - gutter / 2;
cb.moveTo(x, topColumn);
cb.lineTo(x, document.bottom());
}
cb.stroke();
LwgImage img = LwgImage.getInstance("cover.png");
cb.addImage(img, img.getScaledWidth(), 0, 0, img.getScaledHeight(), document.left(), currentY - img.getScaledHeight());
currentY -= img.getScaledHeight() + 10;