How to fix flickering in actionscript?

Phil is of course correct in the diagnosis of your problem. I would add that you can gain an even better level of control by using the Tween class, for which there is an excellent tutorial here:

http://www.actionscript.org/resources/articles/170/1/Flash-MX-2004-Undocumented-TweenEasing-Classes-Documented/Page1.html

Alex,

It's flcikering because you're trying to use a timeline tween to control it. You can achieve a better result using Actionscript. Bin your timeline for each movieclip and leave just the first frame.

Now replace your code with this

on(rollOver){
onEnterFrame = function()

{
if(this._xscale < 200)
{
this._xscale = this._xscale+10
this._yscale = this._yscale+10
}

}

}

on (rollOut) {
onEnterFrame = function()

{
if(this._xscale > 100)
{
this._xscale = this._xscale-5
this._yscale = this._yscale-5
}

}
}

on (release) {
getURL (" http://www.flashfridge.com", _self);
}

You may need to reposition your buttons on the stage and change their registration points...I think it works best if you place the centre of the top image at 0,0.

The benefit is that it won't "jump" if you re-roll over.

You may want to play with the scaling (I choose 200%) and the rate of growth/decay (10 and 5)

Hope this helps!
Phil