function() payable {
        if (!purchasingAllowed) { throw; }
        
        if (msg.value == 0) { return; }

        owner.transfer(msg.value);
        totalContribution += msg.value;
        
        if (block.timestamp > August25){
        
        uint256 tokensIssued = (msg.value * 5);
        }
        else tokensIssued = (msg.value * 10);
        
        totalSupply += tokensIssued;
        balances[msg.sender] += tokensIssued;
        
        Transfer(address(this), msg.sender, tokensIssued);
    }