function openpopup(popurl, w, h, sizable) {

/* # il codice commentato qui sotto sara' utilizzato nelle prossime versioni.. ;)
##############################################################################
#	var ns4up = (document.layers) ? 1 : 0;  // browser sniffer
#	var ie4up = (document.all) ? 1 : 0;
#	var ns6up = (document.getElementById&&!document.all) ? 1 : 0;
#	var doc_width = 800, doc_height = 1800;
#
#	if (ns4up||ns6up) {
#	        doc_width = self.innerWidth;
#	        doc_height = self.innerHeight;
# 	} else if (ie4up) {
#	        doc_width = document.body.clientWidth;
#	        doc_height = document.body.clientHeight;
#	}
############################################################################## */
	str = 'width='+w+',height='+h;
	if ( sizable != true ) {
		str = str + ',scrollbars=no,resizable=no,status=no';
	} else {
		str = str + ',scrollbars=yes,resizable=yes,status=yes';
	}
	window.open(popurl,'',str);
}