ActionScript 2.0 :: Using A Loadvars To Change A Text Field With Buttons?

I'm using a Loadvars to change a text field with buttons, and would like a transition between the text field changes. I have an MC for the transition that moves a block to cover the text at label "up" and one to come down, revealing the new text at label "down". so i did

Code:
btn_mc.onRelease = function(){
transition.gotoAndPlay("up");
field_txt.text=text.text1;
transition.gotoandPlay("down");
}

but the problem is that all those actions happen at once, the text changes before it is covered and the transition MC spazzes out because it doesn't know which to goto first. Is there I can set this function up to be more ordered, so it plays "up" and THEN loads the text, and THEN goes down.