Gallery animation effect

i’ve been trying to figure this out for the past few hours now and have no luck. what i have is about 28 mc on the stage now, i’m setting there alpha to 0 with a for loop. what i want to have happen is start with the first one, t1_mc, tween its alpha to 100 with mc tween and when thats done start on the next one, t2_mc. i’ve tried using a for loop and a while loop but i’m probably doing something wrong cause it doesnt work, i keep getting script errors saying that the script is making flash run slowly…

any help would be wonderful, thanks

ok maybe some code will help get a reply, from my understanding this should go through and tween the alpha to 100, add 1 to i, and go through it again until i<29. all its doing instead is tweening them all at the same time. am i missing something?

var i:Number = 0
while(i<29){
var _thumb:String = "t"+i+"_mc"
_root.gallery[_thumb].alphaTo(100,1)
i++

}