[OpenLayers-Users] HANDLE EXCPETIONS on openlayers

[J.Alejandro Martinez Linares]

Hi people, i need to know how could i know when my wms server is down, 
because i need to show the user a message  to kotificate him about the 
problem, but, for example i have this code that work perfectly:

map.events.on({
      "zoomend" : function (e) {
		scaleCombo.setValue(map.getScale());
           if (this.getZoom()<  2) {
		
				zoomtoggle.onCtrlDeactivate();
				
				aprotegidas.setVisibility(false);
				municipios.setVisibility(false);
				provincias.setVisibility(true);
				ferreas.setVisibility(false);
				autopistas.setVisibility(false);
				l110.setVisibility(false);
				l220.setVisibility(false);
				s220.setVisibility(false);
				s110.setVisibility(false);
				vlayerMunicipios.setVisibility(true);
				asentamientos.setVisibility(false);
				manzanas.setVisibility(false);
				carreteras.setVisibility(false);
				
				if ( vlayerMunicipios.visibility == false )
					{
					inventario.setVisibility(true);
					vlayer.setVisibility(true);
					
					
					tree.getRootNode().eachChild(function(n){
                     n.enable();
					});
					selectvlayerMunicipios.deactivate();
					modifyControl.activate();
					tree.getSelectionModel().select(tree.getRootNode().item(2), null, true);
					
					}
					else
					{
					inventario.setVisibility(false);
					vlayer.setVisibility(false);
					
					tree.getRootNode().eachChild(function(n){
                     n.enable();
					});
					selectvlayerMunicipios.activate();
					modifyControl.deactivate();
					selectvlayerMunicipios.unselectAll();
					tree.getSelectionModel().select(tree.getRootNode().item(2), null, true);
					}								  					
           }}
});

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i need to know when the wms server is down when the map "zoomend" , please help me, thanks.


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