Simple fading gone wrong

m trying to create an overlay to a button which fades in when rolled ofer and out when roledout . Ive got a compact function which takes the hassle out of determining weather to fade in or out but theyres a problem .

It works beautfully but when i try to use it anywhere else the other instances start fading aswell ?

here is my swf/fla , appricatre some help in fixing this