[OpenLayers-Users] positionBlocks null

[benkyma]

I trying to create a popup when the user hovers a marker. To do this I have
the following function, but when I call it, I get an error saying
this.positionBlocks is null.
How do I set the positionBlocks property?  I just want a popup, always in
the same relative position, and always the same size.

	displayPopup: function(marker){
		var popup = new OpenLayers.Popup.Framed("popup_"+marker.id,
				   new OpenLayers.LonLat(marker.lonlat.lon,marker.lonlat.lan),
				   new OpenLayers.Size(140,200),
				   "example popup",
				   marker.icon,
				   false);
		popup.fixedRelativePosition = true;
		popup.lonlat = marker.lonlat;
		popup.imageSrc = initObj.appPath+"images/thumb_bg.png";
		
		marker.map.addPopup(popup);

	}



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