hiding code between line numbers

[Ryan Howard]

I am editing a long program and would like to be able to hide lines 156
to 979.  This would allow me to page up quickly from line 985 and see
variable names created on line 150.  Is there an easy way to do this?

I sometimes split the buffer with Cx-2, but there are cases where I
have multiple sections in the program that I would like to hide just to
allow quicker scrolling.

Any suggestions are welcome.

Ryan