owned

// Submitted by EthereumHistory (ethereumhistory.com)
contract owned {
    address public owner;

    function owned() {
        owner = msg.sender;
    }

    modifier onlyOwner {
        if (msg.sender != owner) throw;
        _
    }

    function transferOwnership(address newOwner) onlyOwner {
        owner = newOwner;
    }
}

contract MyToken is owned { 
    /* Public variables of the token */
    string public name;
    string public symbol;
    uint8 public decimals;
    uint256 public sellPrice;
    uint256 public buyPrice;

    /* This creates an array with all balances */
    mapping (address => uint256) public balanceOf;
    mapping (address => bool) public frozenAccount; 

    /* This generates a public event on the blockchain that will notify clients */
    event Transfer(address indexed from, address indexed to, uint256 value);
    event FrozenFunds(address target, bool frozen);

    /* Initializes contract with initial supply tokens to the creator of the contract */
    function MyToken(uint256 initialSupply, string tokenName, uint8 decimalUnits, string tokenSymbol, address centralMinter) { 
        if (initialSupply == 0) initialSupply = 1000000;    // if supply not given then generate 1 million 
        if(centralMinter != 0 ) owner = msg.sender;         // Sets the minter
        balanceOf[msg.sender] = initialSupply;              // Give the creator all initial tokens                    
        name = tokenName;                                   // Set the name for display purposes     
        symbol = tokenSymbol;                               // Set the symbol for display purposes    
        decimals = decimalUnits;                            // Amount of decimals for display purposes        
    }

    /* Send coins */
    function transfer(address _to, uint256 _value) {
        if (balanceOf[msg.sender] < _value) throw;           // Check if the sender has enough   
        if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows
        if (frozenAccount[msg.sender]) throw;                // Check if frozen
        balanceOf[msg.sender] -= _value;                     // Subtract from the sender
        balanceOf[_to] += _value;                            // Add the same to the recipient            
        Transfer(msg.sender, _to, _value);                   // Notify anyone listening that this transfer took place
    }
    
    function mintToken(address target, uint256 mintedAmount) onlyOwner {
        balanceOf[target] += mintedAmount;  
        Transfer(0, target, mintedAmount);
    }

    function freezeAccount(address target, bool freeze) onlyOwner {
        frozenAccount[target] = freeze;
    
        FrozenFunds(target, freeze);
    }
        
    function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner {
        sellPrice = newSellPrice;
        buyPrice = newBuyPrice;
    }
    
    function buy() {
        uint amount = msg.value / buyPrice;                // calculates the amount
        if (balanceOf[this] < amount) throw;               // checks if it has enough to sell
        balanceOf[msg.sender] += amount;                   // adds the amount to buyer's balance
        balanceOf[this] -= amount;                         // subtracts amount from seller's balance
        Transfer(this, msg.sender, amount);                // execute an event reflecting the change
    }

    function sell(uint256 amount) {
        if (balanceOf[msg.sender] < amount ) throw;        // checks if the sender has enough to sell
        balanceOf[this] += amount;                         // adds the amount to owner's balance
        balanceOf[msg.sender] -= amount;                   // subtracts the amount from seller's balance
        msg.sender.send(amount * sellPrice);               // sends ether to the seller
        Transfer(msg.sender, this, amount);                // executes an event reflecting on the change
    }
}