JS Bingo Board/Game Gen SRC

<b><center>
<script>

var N=0;
var acrosssLetter=0;
var accrossL="";
var downNumber=0;
var Bingo=5;

var comboKey="A";
while(N!=10){
acrossLetter=Math.floor(Math.random()*5);
downNumber=Math.floor(Math.random()*5+1);
if (acrossLetter==0){
accrossL="B";
var comboKey=accrossL+":"+downNumber;
}
if (acrossLetter==1){
accrossL="I";
var comboKey=accrossL+":"+downNumber;
}
if (acrossLetter==2){
accrossL="N";
var comboKey=accrossL+":"+downNumber;
}
if (acrossLetter==3){
accrossL="G";
var comboKey=accrossL+":"+downNumber;
}
if (acrossLetter==4){
accrossL="O";
var comboKey=accrossL+":"+downNumber;
}
document.write("Random Tile #"+N+":<br>"+comboKey+"<br>");
N++;
}

BINOGenBoard();
function BINOGenBoard(){

var across="<br><center><u>B   I   N   G   O</u><br><br></center>";

var down=("B:1 B:2 B:3 B:4 B:5<br>I:1    I:2    I:3    I:4    I:5 <br>N:1 N:2 N:3 N:4 N:5<br>G:1 G:2 G:3 G:4 G:5<br> O:1 O:2 O:3 O:4 O:5<br>");

document.writeln(across+down+'<br><br>The currently generated piece:<br><br><u>'+comboKey);

}
</script>
</body>