Is there a way to make one layer always on top of the rest?

I was wondering if there was a script/plugin that could make one layer appear always on top.

I am busy with an webdesign and I created some safe zones which I like to have on top at all times. However now when I create a new layer I have to manually move that one layer up, which kinda downs my production time.

So is there any way of doing this with a script/plugin?

I added a screenshot of what my safe zones look like.