function show_calendar(str_target, str_datetime) {
	var arr_months = ["Gennaio", "Febbraio", "Marzo", "Aprile", "Maggio", "Giugno","Luglio", "Agosto", "Settembre", "Ottobre", "Novembre", "Dicembre"];
	var week_days = ["Do", "Lu", "Ma", "Me", "Gi", "Ve", "Sa"];
	var n_weekstart = 1; // day week starts from (normally 0 or 1)

	var dt_datetime = (str_datetime == null || str_datetime =="" ?  new Date() : str2dt(str_datetime));
	var dt_prev_month = new Date(dt_datetime);
	dt_prev_month.setMonth(dt_datetime.getMonth()-1);
	var dt_next_month = new Date(dt_datetime);
	dt_next_month.setMonth(dt_datetime.getMonth()+1);
	var dt_firstday = new Date(dt_datetime);
	dt_firstday.setDate(1);
	dt_firstday.setDate(1-(7+dt_firstday.getDay()-n_weekstart)%7);
	var dt_lastday = new Date(dt_next_month);
	dt_lastday.setDate(0);
	
	// html generation (feel free to tune it for your particular application)
	// print calendar header
	var str_buffer = new String (
		"<html>\n"+
		"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\">\n"+
		"<html>\n"+
		"<head>\n"+
		"<title>Marchingfest - The power of music in motion</title>\n"+
		"<META HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=iso-8859-1\"> <!--META PER CARATTERI EUROPEI-->\n"+
		"<META HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=UTF-8\">\n"+
		"<META HTTP-EQUIV=\"imagetoolbar\" CONTENT=\"no\">\n"+
		"<META HTTP-EQUIV=\"keywords\" CONTENT=\"\">\n"+
		"<head>\n"+
		"	<title>Calendario</title>\n"+
		"<style type=\"text/css\">n"+
		"body 			{ color: #CCCCCC; text-decoration: none; font-weight: normal; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 11px; background-color: #000000; margin: 15px auto 0px auto;}\n"+
		"body a          {text-decoration:none; color: #CCCCCC;}\n"+
		"body a:hover    {text-decoration:none; color: #FF9900;}\n"+
		".grigio        {font-size:11px; color:#CCCCCC}\n"+
		".bianco        {font-size:11px; color:#FFFFFF}\n"+
		".azzurro        {font-size:11px; color:#0099FF}\n"+
		".arancio        {font-size:15px; color:#FF9900}\n"+
		".azzurroBig        {font-size:13px; color:#0099FF}\n"+
		".big        	{font-size:18px; color:#0099FF}\n"+
		".LinkGrigio:link,.LinkGrigio:visited {color:#999999; text-decoration:none; font-size:11px;}\n"+
		".LinkGrigio:hover  {color:#FF9900; text-decoration:none; font-size:11px;}\n"+
		".LinkBianco:link,.LinkBianco:visited {color:#FFFFFF; text-decoration:none; font-size:11px;}\n"+
		".LinkBianco:hover  {color:#FF9900; text-decoration:none; font-size:11px;}\n"+
		".LinkAzzurro:link,.LinkAzzurro:visited {color:#0099FF; text-decoration:none; font-size:11px;}\n"+
		".LinkAzzurro:hover  {color:#FF9900; text-decoration:none; font-size:11px;}\n"+
		".LinkNero:link,.LinkNero:visited {color:#000000; text-decoration:none; font-size:11px;}\n"+
		".LinkNero:hover  {color:#FF9900; text-decoration:none; font-size:11px;}\n"+
		"</style>\n"+
		"</head>\n"+
		"<body bgcolor=\"#000000\">\n"+
		"<table class=\"clsOTable\" cellspacing=\"0\" border=\"0\" width=\"100%\">\n"+
		"<tr><td bgcolor=\"#FFFFFF\">\n"+
		"<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
		"<tr>\n	<td bgcolor=\"#F0EFEC\"><a href=\"javascript:window.opener.show_calendar('"+str_target+"', '"+ dt2dtstr(dt_prev_month)+"');\" class=\"LinkAzzurro\">"+
		"<<</a></td>\n"+
		"<td bgcolor=\"#F0EFEC\" colspan=\"5\" align=\"center\" class=\"arancio\">"+
		"<strong>"
		+arr_months[dt_datetime.getMonth()]+" "+dt_datetime.getFullYear()+"</strong></td>\n"+
		"	<td bgcolor=\"#F0EFEC\" align=\"right\"><a href=\"javascript:window.opener.show_calendar('"
		+str_target+"', '"+dt2dtstr(dt_next_month)+"');\" class=\"LinkAzzurro\">"+
		">></a></td>\n</tr>\n"
	);

	var dt_current_day = new Date(dt_firstday);
	// print weekdays titles
	str_buffer += "<tr>\n";
	for (var n=0; n<7; n++)
		str_buffer += "	<td bgcolor=\"#F0EFEC\" align=\"center\" class=\"azzurroBig\">"+
		"<strong>"+
		week_days[(n_weekstart+n)%7]+"</strong></td>\n";
	// print calendar table
	str_buffer += "</tr>\n";
	while (dt_current_day.getMonth() == dt_datetime.getMonth() ||
		dt_current_day.getMonth() == dt_firstday.getMonth()) {
		// print row heder
		str_buffer += "<tr>\n";
		for (var n_current_wday=0; n_current_wday<7; n_current_wday++) {
				if (dt_current_day.getDate() == dt_datetime.getDate() &&
					dt_current_day.getMonth() == dt_datetime.getMonth())
					// print current date
					str_buffer += "	<td bgcolor=\"#FF9900\" align=\"right\">";
				else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6)
					// weekend days
					str_buffer += "	<td bgcolor=\"#666666\" align=\"right\">";
				else
					// print working days of current month
					str_buffer += "	<td bgcolor=\"000000\" align=\"right\">";

				if (dt_current_day.getMonth() == dt_datetime.getMonth())
					// print days of current month
					str_buffer += "<a href=\"javascript:window.opener."+str_target+
					".value='"+dt2dtstr(dt_current_day)+"'; window.close();\" class=\"LinkBianco\">"+
					"";
				else 
					// print days of other months
					str_buffer += "<a href=\"javascript:window.opener."+str_target+
					".value='"+dt2dtstr(dt_current_day)+"'; window.close();\" class=\"LinkGrigio\">"+
					"";
				str_buffer += dt_current_day.getDate()+"</a></td>\n";
				dt_current_day.setDate(dt_current_day.getDate()+1);
		}
		// print row footer
		str_buffer += "</tr>\n";
	}
	
	var vWinCal = window.open("", "Calendar", "width=250,height=215,status=no,resizable=yes,top=200,left=200");
	vWinCal.opener = self;
	var calc_doc = vWinCal.document;
	calc_doc.write (str_buffer);
	calc_doc.close();
}
// datetime parsing and formatting routimes. modify them if you wish other datetime format
function str2dt (str_datetime) {
	var re_date = /^(\d+)\/(\d+)\/(\d+)/;
	if (!re_date.exec(str_datetime))
		return alert("Invalid Datetime format: "+ str_datetime);
	return (new Date (RegExp.$3, RegExp.$2-1, RegExp.$1, RegExp.$4, RegExp.$5, RegExp.$6));
}
function dt2dtstr (dt_datetime) {
	return (new String (
			dt_datetime.getDate()+"/"+(dt_datetime.getMonth()+1)+"/"+dt_datetime.getFullYear()+""));
}
	
	
