function showhide(id) {
	var textBlock = document.getElementById(id);
	(textBlock.className == 'show') ? textBlock.className = 'hide' : textBlock.className = 'show';
}
function show_calendar(str_target, str_datetime) {

	var arr_months = ["январь", "февраль", "март", "апрель", "май", "июнь",
		"июль", "август", "сентябрь", "октябрь", "ноябрь", "декабрь"];
	var week_days = ["Вс", "Пн", "Вт", "Ср", "Чт", "Пт", "Сб"];
	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 (

		"<table class=\"calendar\">\n"+
		"<tr class=\"th1\">\n	<td align=\"left\"><a href=\"javascript:show_calendar('"+
		str_target+"', '"+ dt2dtstr(dt_prev_month)+" '+document.cal.time.value);\" title=\"Предыдущий\">"+
		"<img src=\"images/c_left.gif\"></a></td>\n"+
		"	<td class=\"cth1\" align=\"center\" colspan=\"5\">"
		+arr_months[dt_datetime.getMonth()]+" "+dt_datetime.getFullYear()+"</td>\n"+
		"	<td align=\"right\"><a href=\"javascript:show_calendar('"
		+str_target+"', '"+dt2dtstr(dt_next_month)+" '+document.cal.time.value);\" title=\"Следующий\">"+
		"<img src=\"images/c_right.gif\"></a></td>\n</tr>\n"
	);

	var dt_current_day = new Date(dt_firstday);
	// print weekdays titles

	str_buffer += "<tr class=\"th2\">\n";
	for (var n=0; n<7; n++)
		str_buffer += "	<td>"+
		week_days[(n_weekstart+n)%7]+"</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>";

				else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6)

					// weekend days
					str_buffer += "	<td>";

				else

					// print working days of current month
					str_buffer += "	<td>";

				if (dt_current_day.getMonth() == dt_datetime.getMonth())

					// print days of current month

					{
						if (n_current_wday == 5 || n_current_wday == 6)
					 	str_buffer += "<b>";

						if (dt_current_day.getDate() == dt_datetime.getDate() &&
					dt_current_day.getMonth() == dt_datetime.getMonth())
					 	str_buffer += "<b class=\"realdate\">";

					}
				else 

					// print days of other months

					 str_buffer += "<i>";

				str_buffer += dt_current_day.getDate()+"</td>\n";
				dt_current_day.setDate(dt_current_day.getDate()+1);

		}

		// print row footer
		str_buffer += "</tr>\n";

	}

	// print calendar footer

	str_buffer +=

		"<tr class=\"time\"><td colspan=\"7\"><form name=\"cal\"><input type=\"hidden\" value=\""+dt2tmstr(dt_datetime)+"\" name=\"time\">\n"+
		"Текущее время: "+dt2tmstr(dt_datetime)+
		"</form>\n</td></tr>\n" +
		"</table></b>\n";


	document.getElementById('callendarHere').innerHTML = str_buffer;

}

// datetime parsing and formatting routimes. modify them if you wish other datetime format

function str2dt (str_datetime) {

	var re_date = /^(\d+)\-(\d+)\-(\d+)\s+(\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()+""));
}

function dt2tmstr (dt_datetime) {

	return (new String (
			dt_datetime.getHours()+":"+dt_datetime.getMinutes()+":"+dt_datetime.getSeconds()));
}