Toggle Checkbox kml files

[Krad]

Hello,

I'm having truble with the remove of a kml overlay when a checkbox is
used can some one help?

http://www.mu130.acres-air.co.uk/map2.html

the code is this:-

<script type="text/javascript">
var map;
 function initialize() {
   map = new GMap2(document.getElementById("map_canvas"));
   map.setCenter(new GLatLng(51.8951, -2.0699), 13);
   map.addControl(new GLargeMapControl());
   map.addControl(new GMapTypeControl());
   map.enableGoogleBar();
 }
         function toggleKml(file) {
  var kmlCheckbox = document.getElementById(file);
   if (kmlCheckbox.checked){
          var kml = new GGeoXml('http://www.mu130.acres-air.co.uk/Maps/' +
file + '.kml');
    map.addOverlay(kml);
}
         else{
          map.removeOverlay();
         }
         }

    </script>

html bit

div map works fine

<input type="checkbox" id="univeristy"
onclick="toggleKml('univeristy');"/>

it loads the overlay just can't get it to remove?

also would I get more problems with more overlays and the memeroy
location of the kml??

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