Macro to Hide/Unhide Cells

[Corby10]

I am wanting to create a macro (that will be attached to a button) where I can hide/unhide rows based on if they have a zero value in a certain column. I have attached an example workbook which shows two separate value sets (rows 10-30 and 34-59) where if there is zero value in column G, I want to be able to run the macro to hide the rows with a zero. I also want to be able to run the same macro to unhide, so sort of like an on/off switch.

Any help creating this macro would be greatly appreciated!

Thanks!