Sephiroth XMLObject problem

Hi all,

Im using sephiroth’s XMLObject (Code here http://www.sephiroth.it/_temp/xmlobject.html) to get Objects converted to XML. works fine

but when i try to add XML returned by class it says NaN

heres the code


var outXml;
tempX = new XMLObject().parseObject(cartItem, "item");
outXml += tempX;
trace(outXml); //traces NaN 

Any Help???