chat.html is not working

[MohamedAlaa]

I've tried to play with chat/chat.html but it's missing something.

Uncaught ReferenceError: web3 is not defined at chat.html:120

do we need to link a specific javascript file?

Thanks,
Mohamed.

[sumitsg10]

$(window).load function() {
web3.eth.getAccounts(function(err,accs) {
if (err != null) {
alert("There was an error fetching your accounts.");
return;
}

if (accs.length == 0) {
  alert("Couldn't get any accounts! Make sure your Ethereum client is configured correctly.");
  return;
}

accounts = accs;
account = accounts[0];

refreshBalance();

});
}