My code is:

var customIcons = {
      restaurant: {
        icon: 'http://labs.google.com/ridefinder/images/mm_20_blue.png'
      },
      bar: {
        icon: 'http://labs.google.com/ridefinder/images/mm_20_red.png'
      }
    };

    function load() {
      var map = new google.maps.Map(document.getElementById("map"), {
        center: new google.maps.LatLng(37.4805016667, 126.952741667),
        zoom: 12,
        mapTypeId: 'roadmap'
      });
      var infoWindow = new google.maps.InfoWindow;

      // Change this depending on the name of your PHP file
      downloadUrl("**mark_info4.xml**", function(data) {
        var xml = data.responseXML;
        var markers = xml.documentElement.getElementsByTagName("marker");
        for (var i = 0; i < markers.length; i++) {
          var name = markers[i].getAttribute("time");
          var address = markers[i].getAttribute("sectionspray");
          var type = markers[i].getAttribute("pdistance");
      var td = markers[i].getAttribute("totaldistance");
          var point = new google.maps.LatLng(
              parseFloat(markers[i].getAttribute("latitude")),
              parseFloat(markers[i].getAttribute("longitude")));
          var html = "<b>" + "Time:"+name + "</b> <br/>" + "Spray:"+address+"<br/>"+"Dis:" + type+ "<br/>"+"Total dis:"+td;
          var icon = customIcons[type] || {};
          var marker = new google.maps.Marker({
            map: map,
            position: point,
            icon: icon.icon
          });
          bindInfoWindow(marker, map, infoWindow, html);
        }
      });
    }

    function bindInfoWindow(marker, map, infoWindow, html) {
      google.maps.event.addListener(marker, 'click', function() {
        infoWindow.setContent(html);
        infoWindow.open(map, marker);
      });
    }

    function downloadUrl(url, callback) {
      var request = window.ActiveXObject ?
          new ActiveXObject('Microsoft.XMLHTTP') :
          new XMLHttpRequest;

      request.onreadystatechange = function() {
        if (request.readyState == 4) {
          request.onreadystatechange = doNothing;
          callback(request, request.status);
        }
      };

      request.open('GET', url, true);
      request.send(null);
    }

    function doNothing() {}

In chrome or IE browser, I could load this .html file very well when this html file and mark_info4.xml were in raspberryPi; /var/www/.
but when I moved them to usb or c:/abc, only blank map was loaded and didn't parsing.. I changed url(bolded part) to 'E:/mark_info4.xml' and 'c:/abc/mark_info4.xml' but it didn't work.

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