Editors
Vassilis Fotopoulos, Hellenic Open University, GreeceAthanassios Skodras, Hellenic Open University, Greece
Section Editors
Vassilis Fotopoulos, Hellenic Open University, GreeceDimitris Kalles, Hellenic Open University, Greece
Achilles Kameas, Hellenic Open University, Greece
Milan Stork, University of West Bohemia, Plzen, CZ
Bill Vassiliadis, Hellenic Open University, Greece
Michalis Xenos, Hellenic Open University, Greece
Layout Editor
Eleni Varsaki, Hellenic Open University, GreeceProofreader
Lefteris Chrysochos, Hellenic Open University, GreeceCopyright © 2007-2008 Editorial office of Hellenic Open University Journal of Informatics
Digital Systems and Media Computing Laboratory, School of Science and Technology
GR-26222, Tsamadou 13-15, Patras, Greece
Tel:+30-2610-367529 Fax:+30-2610-367520 E-mail:vfotop1@eap.gr