XML/javascript parsing nodes - vocabulary

for XML string that contains Sales Orders and Details with SKU and Qty...

var myOrders = 
"<?xml version='1.0' encoding='UTF-8'?>" +
"<Orders>" +
   "<Order>" +
      "<OrderHeader>" +
          "<OrderNo>12345</OrderNo>" +
      "</OrderHeader>" +
      "<OrderDetails>" +      
         "<Sku>ABC</Sku>" +
         "<Qty>2</Qty>" +
         "<Sku>DEF</Sku>" +
         "<Qty>3</Qty>" +
      "</OrderDetails>" +
   "</Order>"....
"</Orders>";

I can parse with javascript in Mozill alike this..

parser=new DOMParser();
xmlDoc=parser.parseFromString(myOrders,"text/xml");    
myValue = xmlDoc.getElementsByTagName("Order");

// list all all SKUs ordered
for(i = 0; i < myValue.length; i++){    
    console.log(myValue);
    var order = myValue[i].firstChild.firstChild.firstChild.nodeValue;
    document.write(order + "<br>");
}

Can I replace this line:

    var order = myValue[i].firstChild.firstChild.firstChild.nodeValue;

with something more specific

something like...

  var order = myValue[i]['Order']['OrderDetail']['Sku'].nodeValue;