token with dividend

contract tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData); }

contract MyToken {
    /* Public variables of the token */
    string public name;
    string public symbol;
    string public version;
    uint8  public decimals;
    uint256 public totalSupply;

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

    /* An array of owners is required to iterate over owners */
    address[] public owners;

    /* Address could be deleted from owners array if owned token are 0 */
    function del(uint _idx)  {
      var addr=owners[_idx];
      if(balanceOf[addr]>0) throw;
      owners[_idx]=owners[owners.length-1];
      owners.length=owners.length-1;
    }

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

    /* Initializes contract with initial supply tokens to the creator of the contract */
    function MyToken(
        uint256 initialSupply,
        string tokenName,
        uint8 decimalUnits,
        string tokenSymbol
        ) {
        balanceOf[msg.sender] = initialSupply;              // Give the creator all initial tokens
        owners[owners.length++] = msg.sender;
        totalSupply = initialSupply;                        // Update total supply
        name = tokenName;                                   // Set the name for display purposes
        symbol = tokenSymbol;                               // Set the symbol for display purposes
        decimals = decimalUnits;                            // Amount of decimals for display purposes
        dividendDistribution = false;
    }

    /* Send coins */
    function transfer(address _to, uint256 _value) {
        if (dividendDistribution) throw;                      //cannot transfer token while dividend is happening
        if (balanceOf[msg.sender] < _value) throw;           // Check if the sender has enough
        if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows
        var exist = balanceOf[_to] > 0;                      // Check if recipient already exist in list
        balanceOf[msg.sender] -= _value;                     // Subtract from the sender
        balanceOf[_to] += _value;                            // Add the same to the recipient
        if(!exist)      
          owners[owners.length++]=_to;                       // Add to the array of owners if there wasn't
        Transfer(msg.sender, _to, _value);                   // Notify anyone listening that this transfer took place
    }

    bool public dividendDistribution;   // if true dividend distribution is happening
    uint public last;                   // if a dividend operation was happening but did not finish it stores the next index to iterate
    uint public dividendBalance;        // balance to share for dividends
    function dividend() {
      if( balanceOf[msg.sender]==0 ) throw;                          // only token owners could call
      if( !dividendDistribution && this.balance < 10 finney) throw;  // only if there is some budget share dividend could happen
      uint start;
      if(!dividendDistribution)  {
        dividendDistribution = true;
        dividendBalance = this.balance;
        start = 0;
      } else {
        start = last;
      }
      for(var i=start ; i< owners.length;i++) {
        if(msg.gas<20000) {   // if I am running out of gas, I am saving status and exiting
          last = i;
          return;
        }
        if(balanceOf[owners[i]]>0) {
          owners[i].send( dividendBalance * balanceOf[owners[i]] / totalSupply );
        }
      }
      dividendBalance = 0;
      dividendDistribution=false;
    }


    function () {

    }
}