Hi Juergen, welcome to Pharo (and Seaside). It would better to ask these Seaside related questions on the Seaside user list since this mailing list here is the general list for Pharo users and your question is more related to web development and Seaside. So please ask you question on the following mailinglist http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside JQuery Mobile for Seaside may not have been updated yet since Seaside 3.1. is very new. Last demo of JQM I know of is http://jquerymobile.seasidehosting.st and it is running on 3.0. BTW: there is also a Seaside developer list which is for people who want to contribute to Seaside itself http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside-dev Maybe you also want to have a loook at my Bootstrap project for Seaside these days as it wraps Twitter bootstrap which is also "mobile first" these days. Sample and link to the project can be found at: http://pharo.pharocloud.com If you want to run it locally just use a fresh Pharo 3.0 image (get.pharo.org or files.pharo.org) and load it from the config browser (World menu -> config browser -> Bootstrap). Have fun Torsten