If _alpha >= 100 do this, if _alpha <=0 do this

Hi,

having a bit of a problem with a thingie in Flash mx 2004 I am doing.
I have a movie clip (dnk) 7 (not key!)frames long, with 7 different objects (mc’s) inside, named dnk0-dnk6.

Then, on the mc (dnk) I have:

onClipEvent (enterFrame) {
strDnk = “dnk”+(_currentframe-1);
alpha = getProperty(strDnk, _alpha);

if (_root.dnk.dnk0._alpha<0) {
alpha1 = alpha+10;
} else {
alpha1 = alpha-10;
}

setProperty(strDnk, _alpha, alpha1);
gotoAndStop(nextFrame);
}

So, the idea is, to have this mc’s (dnk0-dnk6) fading one after the other in a sequence. Which happens as it is supposed to, but what I am trying to do now, is reverse it. With no luck, as you can see from the top script

I was thinking about a solution in a way of telling when _alpha is below 0, than the _alpha would start to rise, until it reaches a hundred, then it would start to fall again.

Help? Have I complicated this beyond reason?

Thanks, matej