ActionScript 2.0 :: If Statement Inside MovieClipLoader Object Work?

I recently built a preloader using the MovieClipLoader object. I used the following events: OnLoadComplete, OnLoadProgress and onLoadStart. I registered my listeners etc and then I decided I wanted to get a bit fancy. So I decided that within the onLoadProgress I would add an"if" statement, this if statement would basically say if the loaded content equals 70 then animate the preloader graphic off the screen using tweening (very simple). The onLoadProgress is continuously called while the content is being loaded but it seems that it does not want to correctly execute my if condition.

Here is the code for the onLoadProgress.
loadListener.onLoadProgress = function (target:MovieClip, bytesLoaded:Number, bytesTotal:Number) {
trace("onLoadProgress");
txtLoaded.text = String (Math.floor (bytesLoaded / bytesTotal * 100)) + "% loaded";
mcProgress._xscale = bytesLoaded / bytesTotal * 100; // address the bar
[Code] .....