i should add, its the vertical ones that are the problem.
Vertical lines can be a real problem on layouts with sliding objects, but all layout objects slide if you set them to slide.
Perhaps you want the length of the vertical lines to change as the other objects slide/resize? That's not possible and that's what makes vertical lines a pain on such layouts.
What you can do is extend the line a few points from the body into the footer and they should then make for a continuous vertical line.