// creation of contract object
var MyContract = web3.eth.contract(abi);

// initiate contract for an address
var myContractInstance = MyContract.at('0x78e97bcc5b5dd9ed228fed7a4887c0d7287344a9');

var result = myContractInstance.myConstantMethod('myParam');
console.log(result) // '0x25434534534'

myContractInstance.myStateChangingMethod('someParam1', 23, {value: 200, gas: 2000}, function(err, result){ ... });

//This is where I'm not sure???????
myContractInstance.myStateChangingMethodMultiParm('someParam1', 23, 'someParam2', 23, {value: 200, gas: 2000}, function(err, result){ ... });
// Or
myContractInstance.myStateChangingMethodMultiParm({'someParam1':23, 'someParam2': 23}, {value: 200, gas: 2000}, function(err, result){ ... });