// Title: Timestamp picker
// Description: See the demo at url
// URL: http://us.geocities.com/tspicker/
// Script featured on: http://javascriptkit.com/script/script2/timestamp.shtml
// Version: 1.0
// Date: 12-05-2001 (mm-dd-yyyy)
// Author: Denis Gritcyuk <denis@softcomplex.com>; <tspicker@yahoo.com>
// Notes: Permission given to use this script in any kind of applications if
//    header lines are left unchanged. Feel free to contact the author
//    for feature requests and/or donations

function show_calendar(str_target, str_datetime, calendar) {
	var arr_months = ["Janvier", "Février", "Mars", "Avril", "Mai", "Juin",
		"Juillet", "Août", "Septembre", "Octobre", "Novembre", "Décembre"];
	var week_days = ["Di", "Lu", "Ma", "Me", "Je", "Ve", "Sa"];
	var n_weekstart = 1; // day week starts from (normally 0 or 1)
  var divCalendar = document.getElementById(calendar);

	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=\"clsOTable\" cellspacing=\"0\" border=\"0\" width=\"185px\">\n"+
		"<tr><td bgcolor=\"#1C7F1E\">\n"+
		"<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
		"<tr>\n	<td bgcolor=\"#1C7F1E\"><a href=\"javascript:show_calendar('"+
		str_target+"', '"+ dt2dtstr(dt_prev_month)+"', '"+ calendar + "');\">"+
		"<img src=\"/images/prev.gif\" width=\"16\" height=\"16\" border=\"0\""+
		" alt=\"Voir le mois précédent\"></a></td>\n"+
		"	<td bgcolor=\"#1C7F1E\" colspan=\"4\">"+
		"<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"
		+arr_months[dt_datetime.getMonth()]+" "+dt_datetime.getFullYear()+"</font></td>\n"+
		"	<td bgcolor=\"#1C7F1E\" align=\"right\"><a href=\"javascript:show_calendar('"
		+str_target+"', '"+dt2dtstr(dt_next_month)+"', '"+ calendar + "');\">"+
		"<img src=\"/images/next.gif\" width=\"16\" height=\"16\" border=\"0\""+
		" alt=\"Voir le mois suivant\"></a></td>\n<td><a href=\"#\" onclick=\"javascript:document.getElementById('"+calendar+"').style.display = 'none'\"><img src=\"/images/close.gif\" width=\"16\" height=\"16\" border=\"0\" alt=\"Fermer\"></a></td></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=\"#FFBA00\">"+
		"<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"+
		week_days[(n_weekstart+n)%7]+"</font></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=\"#FFBA00\" align=\"right\">";
				else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6)
					// weekend days
					str_buffer += "	<td bgcolor=\"#FFEC9F\" align=\"right\">";
				else
					// print working days of current month
					str_buffer += "	<td bgcolor=\"white\" align=\"right\">";

				if (dt_current_day.getMonth() == dt_datetime.getMonth())
					// print days of current month
					str_buffer += "<a href=\"#\" onclick=\"javascript:"+str_target+
					".value='"+dt2dtstr(dt_current_day)+"'; document.getElementById('"+calendar+"').style.display = 'none';\">"+
					"<font color=\"black\" face=\"tahoma, verdana\" size=\"2\">";
				else 
					// print days of other months
					str_buffer += "<a href=\"#\" onclick=\"javascript:"+str_target+
					".value='"+dt2dtstr(dt_current_day)+"'; document.getElementById('"+calendar+"').style.display = 'none';\">"+
					"<font color=\"gray\" face=\"tahoma, verdana\" size=\"2\">";
				str_buffer += dt_current_day.getDate()+"</font></a></td>\n";
				dt_current_day.setDate(dt_current_day.getDate()+1);
		}
		// print row footer
		str_buffer += "</tr>\n";
	}
	// print calendar footer
	str_buffer +=
		"</table>\n" +
		"</td>\n</tr>\n" +
		"</table>\n";

	divCalendar.innerHTML = str_buffer;
	divCalendar.style.position = 'absolute';
	divCalendar.style.display = "block";
}
// datetime parsing and formatting routimes. modify them if you wish other datetime format
function str2dt (str_datetime) {
	var re_date = /^(\d+)\/(\d+)\/(\d+)\s*$/;
	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()));
}