Precarga 2da parte con Flash

Código Flash

You want to load a movie and send it directly 
to a given framelabel. So append the framelabel
to the url of the movie like this: 
myMovie.swf?framelabel=scene3
Then inside myMovie.swf you have to isolate the 
framelabel from property _url, wait until the 
given frame is loaded and then you can jump to 
the label. Here is the script:
frame 1:
//This function analyzes the querystring of _url
//and sets the global array parms with the values
//of the query string. 
function getParms(urlstring){
	//divide urlstring in url and searchpart
	var tmpArray = urlstring.split("?");
	//search is global variable for possible later use
	search = tmpArray[1];
	//divide searchpart in var=value strings
	//in our example there is just one of this
	//pairs, but some could provide other variables
	//this way too. 
	tmpArray = search.split("&");
	//convert tmpArray in associative array
	parms = new Array();
	for(var i=0;i<tmpArray.length;i++){
		//split the var=value string into varname and value
		var t = tmpArray[i].split("=");
		//store the pairs in global Array parms
		parms[t[0]] = t[1];
	}
}
//get Parameters of our _url
getParms(_url);
//get the value of variable framelabel (our label to jump to)
label = parms["framelabel"];
if(label eq ""){ // no label given, jump to start of movie
	gotoAndPlay(4);
}

frame 2:
ifFrameLoaded(label){
	gotoAndPlay(label);
}

frame 3:
//go back and check again
gotoAndPlay(2);

frame 4:
//your movie starts here