Another button help issue

so i have some movie clip buttons, and what i want to happen… is rollover and rollout work… then if you press down… it plays like down or something… it works, but when you rollout… it goes to rollout… so what i prob need is a if then else statement, but im not really sure how to write that…

home.onRollOver = function() {
home.gotoAndPlay(“_on”);
}

home.onRelease = function() {
home.gotoAndPlay(“_down”);

}

home.onRollOut = function() {
home.gotoAndPlay(“_off”);
}
ive also included the fla document.