hey,

it's a bit difficult to understand without seeing the project but would it not be easier to make one long flv?
Alternatively you could try something like this

Code:
//Change the FLVPlayback component instance name to "myMovie"
instanceName = myMovie;

//Import .flv file, Change the file name
instanceName.contentPath = "lmyFLV.flv";
var listenerObject:Object = new Object();
//Listens for event to complete, then does an action
    listenerObject.complete = function(eventObject:Object):Void {
    if (instanceName.contentPath == "myFLV.flv") {
//Action when event is complete
        //do something;
    }
};

//The listener
instanceName.addEventListener("complete", listenerObject);
this performs an action once the flv has finished, so you could tell it to load the next swf...