<XML id="empXML">
<data>
	<emp id="1"><name>林根</name></emp>
	<emp id="2"><name>措煉康</name></emp>
</data>
</XML>

<script>
var rootElement;
var xmlDocument = new ActiveXObject("Msxml2.DOMDocument");
try {
	xmlDocument.loadXML (empXML.xml);
	rootElement = xmlDocument.documentElement;
} catch ( e ) {}

var targetEmpNo = "2";
var targetNode 
	= this.rootElement.selectSingleNode("//emp[@id='"+targetEmpNo+"']");
alert(targetNode.selectSingleNode("name").text);
</script>