numberslab

the as below
http://bloggerstop.net/2009/01/how-to-showhide-text-using-javascript.html

http://bloggerstop.net/2009/01/how-to-showhide-text-using-javascript.html

There will be times when you will need to submit a draft that is double-spaced, to permit a grader or editor to make comments. LaTeX does not explicitly support doing this, because, well, it looks ugly.

Still: to double-space a paper, put \renewcommand{\baselinestretch}{2} in your paper's preamble. Give it a try.

$a/b$

becomes

$a/b$