Calling icon colours from a database

[e]

Hello, I'm a bit stuck

I've successfully created a dealer database following the example here
- http://code.google.com/apis/maps/articles/phpsqlsearch.html

and i've read 
http://www.geocodezip.com/v2_basic8g.asp?filename=example_icons.xml
and this group and I'm using various explantions and code from

http://econym.org.uk/gmap/basic16.htm and

to call the marker colour from my mysql databse.

I've checked the xml is outputting the contents of the database - and
all is well, but the icon isn't changing.

I don't get where I am going wrong. Could someone very kindly help me
out?

TIA


// Create our colored marker icons
var gicons=[];
gicons["red"] = new GIcon("mapicons/marker_red.png");
gicons["blue"] = new GIcon("mapicons/marker_blue.png");



   function searchLocationsNear(center) {
     var radius = document.getElementById('radiusSelect').value;
     var searchUrl = 'phpsqlsearch_genxml.php?lat=' + center.lat() +
'&lng=' + center.lng() + '&radius=' + radius;
     GDownloadUrl(searchUrl, function(data) {
       var xml = GXml.parse(data);
       var markers = xml.documentElement.getElementsByTagName
('marker');
       map.clearOverlays();

       var sidebar = document.getElementById('sidebar');
       sidebar.innerHTML = '';
       if (markers.length == 0) {
         sidebar.innerHTML = 'No results found. Please try a bigger
search distance, a postcode or a larger town';
         map.setCenter(new GLatLng(54.9, -4.1), 5);
         return;
       }

       var bounds = new GLatLngBounds();
       for (var i = 0; i < markers.length; i++) {
         var name = markers[i].getAttribute('name');
         var address = markers[i].getAttribute('address');
         var town = markers[i].getAttribute('town');
         var county = markers[i].getAttribute('county');
         var postcode = markers[i].getAttribute('postcode');
         var telephone = markers[i].getAttribute('telephone');
         var icon = markers[i].getAttribute("icon");
         var url = markers[i].getAttribute('url');
         var distance = parseFloat(markers[i].getAttribute
('distance'));
         var point = new GLatLng(parseFloat(markers[i].getAttribute
('lat')),
                                 parseFloat(markers[i].getAttribute
('lng')));
         var marker = createMarker(point, name, address, town, county,
postcode, telephone, url, icon);
         map.addOverlay(marker);
         var sidebarEntry = createSidebarEntry(marker, name, address,
town, county, postcode, telephone, distance);
         sidebar.appendChild(sidebarEntry);
         bounds.extend(point);
       }
       map.setCenter(bounds.getCenter(), map.getBoundsZoomLevel
(bounds));
     });
   }

    function createMarker(point, name, address, town, county,
postcode, telephone, url, distance, icon) {
      var marker = new GMarker(point, gicons[icon]);
      var html = '<b>'+ name + '</b><br>' + address + ', '+ town +
'<br>' + telephone + '<br>' + '<a href=' + url + ' target ="_blank">
'+ url +'</a>';
      GEvent.addListener(marker, 'click', function() {
        marker.openInfoWindowHtml(html);
      });
      return marker;
    }

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