[OpenLayers-Users] addUniqueValueRules .. where to add exactly

[Shadin]

*Hi

I'm trying to apply a simple attribute based styles on my vector layer
the attribute is known as "type" in the database and has these values:
1,2,3,4
I try this :*

var styleMap = new OpenLayers.StyleMap({
                        "default": {		    
                            externalGraphic: "Link to pic 1",
                            fillOpacity: "${opacity}"
                        },
                        "select": {
                            cursor: "crosshair",
                            externalGraphic: "Link to pic 2"
                        },
				
                    });
	
	var lookup = {
	        1: {externalGraphic: "Link to pic"},
                2: {externalGraphic: "Link to pic"},
		3: {externalGraphic: "Link to pic"},
		4: {externalGraphic: "Link to pic"}
				
            };
	
*Then, when I type this line:*
 styleMap.addUniqueValueRules("default", "type", lookup);


*I got nothing on the map. just my base layer
but when I commeted it, I got the normal overlay layer with typical features
without any styling.

am not sure about what wrong here. *
      

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