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MyEthBank.sol

// Freestartupkits.com
pragma solidity ^0.4.11;
contract MyEthBank {
        mapping (address => uint) private balances; 
        address owner; 
        uint constant totalSupply = 10**4;

        
        function MyEthBank() public payable { 
            balances[msg.sender] = totalSupply; 
            owner = msg.sender;
        }
        
        function deposit() public payable { // How Eth is received by bank
            balances[owner] -= msg.value; // owner is bank
            balances[msg.sender] += msg.value;
        }
        
        function send(uint amount, address addr) public { // How Eth is sent
            if(amount >= 0) {      
            // It is important to set this to zero because the recipient
            // can call this function again as part of the receiving call
            // before `transfer` returns (see the remark above about
            // conditions -> effects -> interaction).
            addr.transfer(amount);
            }
        }
        
}