[OpenLayers-Users] Google layer not centering well + minor things

[Cranio]

So I've managed to superimpose a Google layer with my WMS mapserver layers.

I have now a strange behaviour though. While in Firefox everything goes ok,
in IExplorer the WMS map center well, but Google maps don't align.

They seem shifted on the upper left corner, showing a gray border on the
right and bottom side, until I click on the map or zoom: after one
operation,
they align well. Same thing happens when I change Google layer, f.ex. from
Satellite to Hybrid: on the change, the map loses its alignment to gain it
again when I do whatever operation on the map.

Maybe there is a CSS align problem or what? I emphasize that my code is
embedded this way in a CMS (Joomla, as static content):
(note, there's no init() function on BODY onLoad event, the script is
directly executed)

... JOOMLA CODE ...

<div id="map" style="width: 500px;height: 500px;border: 1px solid
gray;"></div>
<script
src='http://maps.google.com/maps?file=api&amp;v=2&amp;key=MYGOOGLEKEY'></script>
<script src="../lib/OpenLayers.js"></script>
<script src="../Firebug/firebug.js"></script>
<script type="text/javascript">
  var map;
  OpenLayers.IMAGE_RELOAD_ATTEMPTS = 3;
  OpenLayers.Util.onImageLoadErrorColor = "transparent";
  delta=480000;
  mapx=1600000;
  mapy=4800000;
  var myWMSMap = "http://path/to/mapserv?map=/path/to/mapfile.map";
  var maxEx = new OpenLayers.Bounds(mapx,mapy,mapx+delta,mapy+delta);
  var resEx = maxEx;
  var options = {projection: "EPSG:26592",units: "m",maxResolution:
1300,maxExtent: maxEx,restrictedExtent: resEx};
  map = new OpenLayers.Map('map', options);
  // create Google Mercator layers
  var gmap = new OpenLayers.Layer.Google("Google
Strade",{'sphericalMercator': true});
  var gsat = new OpenLayers.Layer.Google("Google Satellite",{type:
G_SATELLITE_MAP, 'sphericalMercator': true});
  var ghyb = new OpenLayers.Layer.Google("Google Ibrida",{type:
G_HYBRID_MAP, 'sphericalMercator': true});
  var osm_wms = new OpenLayers.Layer.WMS( "Comuni",myWMSMap,{layers:
"comuni",transparent: "true", format: "png", projection:'epsg:4326'});
  map.addLayers([gmap,gsat,ghyb,osm_wms]);
  map.addControl(new OpenLayers.Control.LayerSwitcher());
  map.addControl(new OpenLayers.Control.EditingToolbar(vector));
  map.addControl(new OpenLayers.Control.MousePosition());
  map.addControl(new OpenLayers.Control.Scale());
  var panel = new OpenLayers.Control.NavToolbar();
  map.addControl(panel);
  map.zoomToMaxExtent();
</script>

... REST OF JOOMLA CODE ...

Another 2 questions:
- I figured out mapExtent by trial and error, but which is the projection
the coords refer to? They seem to be wrong.
- Why are coords and the google logo on the upper left corner?
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