动作脚本（2）问题

AUS.onRollOver

cname.onRollOver

this[cname].onRollOver 

function loadXML(loaded) {
    if (loaded) {
        _root.country = this.firstChild.childNodes;
        var cname = country[0].childNodes[0].firstChild.nodeValue;
        var clink = country[0].childNodes[1].firstChild.nodeValue;
        var cregion = country[0].childNodes[2].firstChild.nodeValue;
        var ctext = country[0].childNodes[3].firstChild.nodeValue;

        trace(cname);
        trace(clink);
        trace(cregion);
        trace(ctext);

        this[cname].onRollOver = function() {
            var colorful = new Color(this);
            colorful.setRGB(0x0099d9);
            subline.text = ctext;
        };
        this[cname].onRollOut = function() {
            var colorful = new Color(this);
            colorful.setRGB(0x939598);
            subline.text = \"\";
        };
        this[cname].onRelease = function(){
            getURL(clink, _self);
        }
    } else {
        content = \"file not loaded!\";
    }
}
xmlData = new XML();
xmlData.ignoreWhite = true;
xmlData.onLoad = loadXML;
xmlData.load(\"countries.xml\");

<?xml version=\"1.0\"?>

<countries>
    <country>
        <name>AUS</name>
        <hyperlink>http://www.google.com.au/</hyperlink>
        <region>australasia</region>
        <infotext>Welcome to Australia</infotext>
    </country>
    <country>
        <name>USA</name>
        <hyperlink>http://www.google.com/</hyperlink>
        <region>australasia</region>
        <infotext>Welcome to America</infotext>
    </country>
</countries>