The options that you are passing in the last json object are: gaslimit and value of Ether to send along. These (and other configurable parameters such as the sender or the gasprice) are available via `msg` and `tx` objects as described [here](http://solidity.readthedocs.io/en/develop/units-and-global-variables.html#block-and-transaction-properties):

    function EscrowPayment(address _seller, address _judge) payable {
        gasLimit = msg.gas; // this is only the *remaining* gas and not the exact value that you passed
        value = msg.value; // in Wei
        gasPrice = tx.gasprice;
        buyer = msg.sender;
        seller = _seller;
        judge = _judge;
    }