[OpenLayers-Users] Layer.Image not working as Overlay

[Marco Scheuble]

Hi community,

I want to generate an overlay from an image ( jpg, png ) with
OL.Layer.Image.
As a baselayer it works, but for some reason adding the property 
"isBaseLayer: false" 
an errormessage is thrown: "a.renderer is undefined OL 636"

As I read some threads in this board, it should work this way in principal. 
For example  thread
<http://osgeo-org.1560.n6.nabble.com/Image-Layer-unable-to-span-across-map-extents-td4657181.html>
  

Or am I wrong And I should try it another way?

cheers, Marco

code:
--------------------------------------------------------------------------------------
var options = {
  maxExtent: new OpenLayers.Bounds( 699000, 227130, 716400, 237580 ),
  scales: [ 200000, 100000, 50000, 25000, 17500, 10000, 5000, 3000, 2000,
1000, 500 ],
  projection: "EPSG:21781",
  units: 'm'
};
map = new OpenLayers.Map( 'Map', options );

...

var overlay = new OpenLayers.Layer.Image( 
  "Test",
"http://www.ritholtz.com/blog/wp-content/uploads/2010/02/Fusion-IQ-floor-plan.png";,
 
  new OpenLayers.Bounds( 707650, 232400, 707850, 232500),
  new OpenLayers.Size( 1086, 513 ),
  {
    isBaseLayer: false,
    //projection: new OpenLayers.Projection("EPSG:21781")
  }
);
--------------------------------------------------------------------------------------







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