From Apus Software:

< type=text/java>
dwImg = null;
function dwTrack() {
if(!dwImg) {
var dwUrl = "http://dw.com.com/redir?destUrl=" + escape("http://dw.com.com/i/b.gif?" + Math.floor(Math.random()*1000));
dwUrl += "&edid=3";
dwUrl += "&oid=3000-13631_4-10284102";
dwUrl += "&onid=13631";
dwUrl += "&siteid=4";
dwUrl += "&ptid=3000";
dwUrl += "&lop=sat_bubble";
dwUrl += "&tag=sat_bubble";
dwImg = new Image;
dwImg.src = dwUrl;
}
}

var saBubble = new Class({
trigger: $E(".from-pub"),
bubble: null,
hiding: false,


initialize: function(elem) {
this.bubble = $(elem);
this.bubble.setOpacity(0);
this.bubble.setStyle("top", this.trigger.offsetHeight + "px");
this.trigger.addEvent("mouseover", function() {
this.show();
dwTrack();
}.bind(this));
this.trigger.addEvent("mouseout", function() {
this.hide();
}.bind(this));
},

show: function() {
$clear(this.hiding);
this.bubble.setStyle("display", "block");
this.bubble.effect("opacity", {duration: 200}).start(1);
this.hidden = false;

},

hide: function() {
this.hiding = this.close.delay(150, this);
},
close: function() {
this.chain(function() {
this.bubble.effect("opacity", {duration: 200}).start(0).chain(function() {
this.callChain();
}.bind(this));
}.bind(this));
this.chain(function() {
this.bubble.setStyle("display", "none");
this.callChain();
}.bind(this));
this.callChain();
}
});
saBubble.implement(new Chain);

new saBubble("sab");