Simple Nav bug

I have a .fla and in it there are 4 frames, each with a stop action on it. they have a navigation set of buttons that are the same in the four frames. each button links to a frame. this is the code:

(I’m using MCs as buttons btw):

this.nav.links_btn.onRelease = function(){
	 			gotoAndPlay("links");
}

When you click a button… it takes you to the correct page, but then if you click it again… it jumps to the next frame. What I’m wanting to know is; How do i stop this from happening?

-ollie