Network and location APIs - HTML5 and CSS3 - page 207

The first step on the client side is to create a new WebSocket instance:
var socket =
new WebSocket(
"ws://localhost:8080/"
);
Then, assign event handlers to the
socket object. In this first example,
the server will wait 10 seconds and
then close the connection, so you
just need to watch the onopen and
onclose events:
socket.onopen = function () {
log("Socket has been opened!");
}
socket.onclose = function () {
log("Socket has been closed");
}
Now let's look at what happens when the server sends a message. In
the browser, you have to handle the onmessage event:
socket.onmessage = function(msg) {
log(msg.data);
}
The data attribute of the event
handler argument contains the
message from the server; in this
case, the current data and time
every 10 seconds.
You can also control the connection
from the browser with the close
method on the socket object:
socket.close();