Calc Guide

To Background and To Foreground
An image or a drawing object can be sent to the background as well.
This is not the same as Bring Forward and Send Backward, which
set the order of a number of overlapping graphics. This feature
pushes a graphic behind the cells, allowing cells to be edited without
affecting the graphic.
A graphic in the background will have To Foreground as a menu
item, instead of To Background.
Anchoring graphics
Anchors tell a graphic where to stay in relation to other items.
Anchor to page
Anchoring a graphic to the page allows it to be positioned in a
specific place on the page. The graphic does not move when cells
are added or deleted. This is equivalent to an absolute reference.
The graphic will always stay by cell B10 if that is where it is placed.
Anchor to cell
Anchoring a graphic to a cell ensures that the graphic always stays
with the content it is originally anchored to. If a graphic is anchored
to cell B10, and a new row is inserted, the graphic will then be
anchored to cell B11. This is equivalent to a relative reference.
For example, in Figure 105 the normal Otto and Tux picture is
anchored To Cell B10 (XXX shows where the picture is anchored). The
inverse Otto and Tux picture is anchored to the page.
Figure 105: Anchoring 1
If two rows are inserted above the pictures, the normal picture
(anchored to cell) will shift down two rows and the anchor will change.
The inverse picture (anchored to page) will not move. This is illustrated
in Figure 106. Note that the anchor symbol and the XXX have moved
down to cell B12.
150 OpenOffice.org 3.x Calc Guide