Parse XML in firefox using javascript

Hi,

I am trying to parse an XML file in order to read data from the XML file.  I am using an Xpath expression in javascript in order to parse the XML file.  Everything works fine in INternet Explorer where I manage to parse the XML file and get back an answer from this file, however I am having problems doing so in Firefox.  I am not able to get any type of answer from the XML file when I use Firefox.

This is my code in javascript:

    <script type="text/javascript">
        var searchString = document.location.search;
        searchString = searchString.substring(1);
        var nvPairs = searchString.split("&");
        for (i = 0; i < nvPairs.length; i++)
        {
            var nvPair = nvPairs[i].split("=");
            var name = nvPair[0];
            var value = nvPair[1];
            if (i == 0) {
                var time = value;
            }
            if (i == 1) {
                var type = value;
            }
            if (i == 2) {
                var soil = value;
            }
        }
        function loadXMLDoc(fname)
        {
            var xmlDoc;
            // code for IE
            if (window.ActiveXObject)
            {

                xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
            }
            // code for Mozilla, Firefox, Opera, etc.
            else if (document.implementation && document.implementation.createDocument)
            {
           
                xmlDoc=document.implementation.createDocument("","",null);
            }
            else
            {
                alert('Your browser cannot handle this script');
            }
            xmlDoc.async=false;
            xmlDoc.load(fname);
            return(xmlDoc);
        }
        xml=loadXMLDoc("Crops to grow.xml");
        path="/Start/month[@on='" + time + "']/product[@id='" + type + "']/land[@type='" + soil + "']/grow";
        // code for IE
        if (window.ActiveXObject)
        {
            var nodes=xml.selectNodes(path);
            for (i=0;i<nodes.length;i++)
            {
                document.write("PRODUCTS TO GROW: ",nodes[i].childNodes[0].nodeValue);
                document.write("<br /> <br />");
            }
        }
        // code for Mozilla, Firefox, Opera, etc.
        else if (document.implementation && document.implementation.createDocument)
        {
           
            var nodes=document.evaluate(path, xml, null, XPathResult.ANY_TYPE, null);
            var result=nodes.iterateNext();
            while (result)
            {
                document.write(result.childNodes[0].nodeValue);
                document.write("<br />");
                result=nodes.iterateNext();
            }
        }
    </script>

It appears that the code which has to do with the Firefox browser is being neglected by javascipt!! Could someone please help me to identify the problem.

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