if(window.XMLDocument && document.implementation.hasFeature("XPath", "3.0") && !XMLDocument.prototype.selectNodes)
{
    XMLDocument.prototype.selectNodes = function(cXPathString, xNode)
    {
        if( !xNode ) { xNode = this; }

        var oNSResolver = this.createNSResolver(this.documentElement);
        var aItems = this.evaluate(cXPathString, xNode, oNSResolver, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
        var aResult = [];
        for( var i = 0; i < aItems.snapshotLength; i++)
        {
            aResult[i] =  aItems.snapshotItem(i);
        }

        return aResult;
    };

    XMLDocument.prototype.selectSingleNode = function(cXPathString, xNode)
    {
        if( !xNode ) { xNode = this; }

        var oNSResolver = this.createNSResolver(this.documentElement);
        var xItems = this.evaluate(cXPathString, xNode, oNSResolver, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
        if (xItems.snapshotLength > 0)
        {
            return xItems.snapshotItem(0);
        }
        else
        {
            return null;
        }
    };


    Element.prototype.selectNodes = function(cXPathString)
    {
        if(this.ownerDocument.selectNodes)
        {
            return this.ownerDocument.selectNodes(cXPathString, this);
        }
        else{throw "For XML Elements Only";}
    };

    Element.prototype.selectSingleNode = function(cXPathString)
    {

        if(this.ownerDocument.selectSingleNode)
        {
            return this.ownerDocument.selectSingleNode(cXPathString, this);
        }
        else{throw "For XML Elements Only";}
    };
};