Hi Andreas, I'm using OpenLayers 2.11 that includes the Tween class. I'm also including the style.css found in this version. Thank you, Luís -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Questions-on-animated-zooms-tp5035763p5039027.html Sent from the OpenLayers Users mailing list archive at Nabble.com.