[OpenLayers-Users] Real-time image in Openlayer

[ar_gaeta]

Hi all, 
I have a problem. 
I have 1 image from weather radar (file .png) that is produced every 5
minutes and copied always in the same directory with the same name. So each
new image overwrite the previous one. 
I load this image as an OpenLayer.Image, because as WMS was very slow to
load: 

var raster_options = {isBaseLayer: false, alwaysInRange: true, opacity: 0.6 
        , buffer: 0 //don't work 
        //, strategies: new OpenLayers.Strategy.Refresh({force: true,
interval:1000}) //don't work 
        }; 

var refresh_test = new OpenLayers.Layer.Image("Pioggia: Refresh_test", 
        "http://localhost:8008/mapguide/meteo/raster/refresh_test.gif", 
        new OpenLayers.Bounds(673593, 5307580, 1251128, 5881858) 
        , new OpenLayers.Size(500, 500), raster_options,
{displayInLayerSwitcher:false} 
    ); 
refresh_test.setVisibility(true); 
refresh_test.redraw(true); 

I've tried a lot of options: 
- destroy and re-add the image to the map each 5 seconds (just to test); 
- remove the layer from the map and re-add it; 
- define again the url of the layer, and reload it; 
- set the visibility alternatively "false/true" with the hope this could
work to refresh the image. 

But nothing happens! 
Could you please help me? I'll be very grateful for any help/suggestion. 

If you need more information please don't hesitate to ask! 

Thanks, 
Riccardo 


P.S.: I'm using OpenLayer 2.10 installed on my Windows 7 PC. I load the
layers inside a mapPanel.map with the help of GeoExt.

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