Greetings!

I have the following image of a soccer pitch. I would like to draw on top of it a grid (5 by 20). The image size is 340 by 500 pixels.

How can I draw the grid with equal spacing? i.e. gaps for vertical lines set to 68 pixels and gaps for horizontal lines set to 25? I would also like to number the horizontal lines 0 - 20 With the half way line being 10.

I am a bit of a newbie with PSP. I know how to draw straight lines but not quite sure how to get the spacing right.

Any suggestions are welcome.

Oh I almost forgot! Here's the image I'm using: