Can change 'left/right' TextEdit margins, but not 'top/bottom'
I have seen various solutions to changing TextEdit's default margins (1440 pixels -or- 1 inch). These involve changing the pixel spec in the codes that can be viewed when "Ignore Rich Text Commands" is selected in the File > Open dialog.
There are supposed to be codes for each of the four dimensions: i.e., left, right, top and bottom. However, when I view these codes I see only codes for 'left' and 'right.' When I attempted to create codes for 'top' and 'bottom' they simply appeared in the document text itself.
Can anyone explain why that may be happening, and how I can also alter the top and bottom margins?
Thanks.
MacBook, Mac OS X (10.6.3), 1.83 MHz