How To Get the Attributes for the Map Feature That the Mouse is Over

After the map has loaded, use the subscribe API to set a function to be called when the current feature changes. 

<html.
<head>
    <script type="text/javascript" src="map_data/swfobject.js"></script>
    <script type="text/javascript" src="map_data/avenza.js"></script>
    <script type="text/javascript">
        var theMap = AVENZA.embedViewer("map", "750", "500", 
            {
                baseURL:"map_data/",
                loadedCB: onMapLoaded,
                flashSecuritySandbox: AVENZA.AUTO_SANDBOX
            }
        );

        function onMapLoaded() {
            theMap.subscribe(AVENZA.FEATURE, "onMouseOver");
        }

        function onMouseOver(feature) {
            var o = document.getElementById("output");
            if (o) {
                o.innerHTML = "The mouse is now over: " + feature.attributes.STATE_NAME;
            }
        }       
    </script>

</head>
<body>
    <div style="position:relative"> 
        <div id="map">
        </div>
        <hr>
        <div id="output">
            Move the mouse over the map.
        </div>
    </div>
</body>
</html>

You can see a live example here.