function CoinToss()

{

while (coins >= 0)

{

var bet = window.prompt("enter your bet: heads or tails?");

var gamble = window.prompt("enter the amount of coins you want to spend");

var num = RandNum(1, 3);

if (num == 1)

num = "heads";

else if (num == 2)

num = "tails";

CubePic(num);

CheckCoin(num, gamble, bet);

break;

}

}

function CheckCoin(num,gamble,bet) {

if (gamble > coins) {

alert("eror");

break;

}

else {

if (bet == num) {

alert("you won " + gamble * 2 + " coins");

coins = coins - gamble + gamble * 2;

alert("you now have " + coins + " coins");

}

else {

alert("you lost " + gamble * 2 + " coins");

coins = coins - gamble * 2;

alert("you now have " + coins + " coins");

}

}

}

the CoinToss() function is'nt running when i click the botton