Commenting and uncommenting lines

How would I use vim to quickly commend and uncomment lines?

It just needs to add # to X number of lines from the current line.

The uncomment I could do with regexp (s/^#//), but if there is a better way I'd love to hear it.

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bayesianmindAuthor Commented:
Thanks that does the job but it adds a large yellow bar to the left side of the window.. what is that and how do I get rid of it?
2 options to remove the yellow mark:

1: use ma and mb instead of . and .+5
   mark 1st line with ma
  mark last line with mb (use down arrow to navigate)

2. exit and open again
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