Here you have a FLA with the ultimate button collection..
There are many different style possibilities and you can edit each button separately. They are each contained in their own movieclips and all different objects. The buttons are real easy to edit. All you need to do is drag it into your project and add your function i.e. gotoAndPlay() to each button accordingly.
Each style of button is in a different folder so easy for you to see what’s what. The documentation explains how to edit the file.
Everything is vector so you can resize it to whatever sizes you want.