Quiz Problem, How To Stop, Uses With Out A Valid Name?

hi guys, im new to flash, an trying to buld a quiz application in flash,,,,

everythings are workin fine, expect few things,,,,
take a look at my code:

Code:


stop();

/**************************************
here we include the external file with
the list of our question and answers
**************************************/

/*******************************************************************************
correct syntax:

domX=["Question", n° correct answer,["answer1","answer2","answer3",...,"answerN"]

******************************************************************************/
frage = [
dom1=["Wie heißt die Hauptstadt von Ägypten?",3,["Kabul","Thimphu","Asmara","Kairo"]],
dom2=["Wie heißt die Hauptstadt von Vietnam?",0,["Hanoi","Honiara","Havanna","Khartoum","Maputo"]],
dom3=["Wie heißt die Hauptstadt von Sri Lanka?",1,["Colombo","Sri Jayavardhanapura","Jaffna","Trincomaly"]],
dom4=["Wie heißt die Hauptstadt von USA? ",2,["Wellington","Warschau","Washington","New York","Ottawa"]],
dom5=["Wie heißt die Hauptstadt von Griechenland?",4,["Astana","Avarua","Antananarivo","Apia","Athen"]]
];

/*************************************/

toDisplay = 5;// how many question to display



// Random generation Questions
Object.prototype.nextAnswer = function(){
ranQuestion = random(frage.length)
for(var i = 0; i < frage.length; i++){
if(ranQuestion == tempArray[i]){
var prosegui = false;
nextAnswer();
break;
}
var prosegui = true;
}
if(prosegui){
tempArray.push(ranQuestion);
return ranQuestion;
}
}



// Remove the old points
Object.prototype.removePoints = function(what,keep){
for(var clips in _root.box){
if(_root.box[clips]._name.substring(0,_root.box[clips]._name.length -1) == what.substring(0,what.length-1) && _root.box[clips] != _root.box[what]){
_root.box[clips].point._visible = 0
}
}
}


// remove old answers
Object.prototype.removeAllAnswer = function(){
for(var answer in _root.box){
removeMovieClip(_root.box[answer])
}
}

// Build the Question
Object.prototype.buildQuestion = function() {
creaNuovoArray();
countAnswer++;
delete myChoice;
// call function to generate a random unique question
nextAnswer();
numero_domanda = "Hi "+username+" Frage #" + countAnswer;// current Question
domanda = (frage[ranQuestion][0])// Assing Question txt
removeAllAnswer();
// build answers;
for(var i = 0 ; i < frage[ranQuestion][2].length ; i++){
nextRisposta();
duplicateMovieClip("box.answer","answer"+i,i)
box["answer"+i].y_fin = answer0._y + (20*i)
box["answer"+i].txt = frage[ranQuestion][2][ranAns]
if(ranAns == frage[ranQuestion][1]){
box["answer"+i].thisChoice = true
} else {
box["answer"+i].thisChoice = false
}
}
box.answer._visible = 0
}

// Building random answers
function creaNuovoArray(){
delete tempRis;
tempRis = new Array();
}

Object.prototype.nextRisposta = function(){
ranAns = random(frage[ranQuestion][2].length)
for(var i = 0; i < frage[ranQuestion][2].length; i++){
if(ranAns == tempRis[i]){
var prosegui = false;
nextRisposta();
break;
}
var prosegui = true;
}
if(prosegui){
tempRis.push(ranAns);
return ranAns;
}
}




in the first frame i let user to put their name in..
so that i can print their name in each questions like a title..

what i now need is i want to block or give an error message if the user clicks on the "Play Quiz" button with out give any name,, in to the input field...
i tried many ways,, nothings works,,,,,,,

please help me with this quiz thing,,, i have some other qustions fist is this one,,

many thanks in advance

-stagy

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