function setdvalue(targetnameid, svalue){
  try{
    var ele = document.getElementById(targetnameid);
    ele.value = svalue;
  }catch(e){}
  try{
    if (ele.onchange) ele.onchange();
  }catch(e){}
}
var oldcolor="";
var orgtarget=null;
var domain="";
function clearcal(){
 try{
 if (orgtarget!=null){
   orgtarget.style.backgroundColor=oldcolor;
 }
 }catch(e){}
 orgtarget=null;
}
function show_calendar(targetnameid, str_datetime, str_display, xdomain) {
        clearcal();
        var str_target = document.getElementById(targetnameid);
        if (!str_target) return;
        if (xdomain) domain = xdomain;
        if (!str_datetime) str_datetime = str_target.value;
	var arr_months = ["Januar", "Februar", "März", "April", "Mai", "Juni",
		"Juli", "August", "September", "Oktober", "November", "Dezember"];
	var week_days = ["So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"];
	var n_weekstart = 1;

	var dt_datetime;
        if ((str_datetime == null) || (str_datetime =="")){
          dt_datetime = new Date();
        } else {
          dt_datetime = str2dt(str_datetime);
          str_target.value = formatDate(dt_datetime);
        }
        var dt_display;
        if (!str_display){
          dt_display = new Date(dt_datetime);
        } else {
          dt_display = str2dt(str_display);
        }
	dt_display.setDate(1);

	var dt_prev_year = new Date(dt_display);
	dt_prev_year.setYear(dt_prev_year.getFullYear()-1);
	var dt_next_year = new Date(dt_display);
	dt_next_year.setYear(dt_next_year.getFullYear()+1);

	var dt_prev_month = new Date(dt_display);
	dt_prev_month.setMonth(dt_display.getMonth()-1);
	var dt_next_month = new Date(dt_display);
	dt_next_month.setMonth(dt_display.getMonth()+1);
	var dt_firstday = new Date(dt_display);
	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);
	var str_buffer = new String (
		"<html>\n"+
		"<head>\n"+
		"<title>Kalender</title>\n"+
		"</head>\n"+
		"<body onUnload=\"window.opener.clearcal()\" bgcolor=\"White\">\n"+
		"<table  cellspacing=\"0\" border=\"0\" width=\"100%\">\n"+
		"<tr><td bgcolor=\"#4682B4\">\n"+
		"<table bgcolor=\"#DCDCF4\" cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
		"<tr>\n	<td colspan=\"2\" bgcolor=\"#DCDCF4\"><a href=\"javascript:window.opener.show_calendar('"+
		targetnameid+"','"+dt2dtstr(dt_datetime)+"', '"+ dt2dtstr(dt_prev_year)+"');\">"+
		"<img src=\"http://www.incomingsoft.de/publicsoft/images/pager/skipprev.gif\" border=\"0\" height=\"15\""+
		" title=\"vorheriges Jahr\"></a>&nbsp;&nbsp;"+
                "<a href=\"javascript:window.opener.show_calendar('"+
		targetnameid+"','"+dt2dtstr(dt_datetime)+"', '"+ dt2dtstr(dt_prev_month)+"');\">"+
		"<img src=\"http://www.incomingsoft.de/publicsoft/images/pager/prev.gif\" border=\"0\" height=\"15\""+
		" title=\"vorheriger Monat\"></a>"+
                "</td>\n"+
		"<td align=\"center\" bgcolor=\"#DCDCF4\" colspan=\"4\">"+
		"<font color=\"black\" face=\"tahoma, verdana\" size=\"2\">"
		+arr_months[dt_display.getMonth()]+" "+dt_display.getFullYear()+"</font></td>\n"+
		"<td colspan=\"2\" bgcolor=\"#DCDCF4\" align=\"right\"><a href=\"javascript:window.opener.show_calendar('"
		+targetnameid+"','"+dt2dtstr(dt_datetime)+"', '"+dt2dtstr(dt_next_month)+"');\">"+
		"<img src=\"http://www.incomingsoft.de/publicsoft/images/pager/next.gif\" border=\"0\" height=\"15\""+
		" alt=\"nächster Monat\"></a>&nbsp;&nbsp;"+
                "<a href=\"javascript:window.opener.show_calendar('"
		+targetnameid+"','"+dt2dtstr(dt_datetime)+"', '"+dt2dtstr(dt_next_year)+"');\">"+
		"<img src=\"http://www.incomingsoft.de/publicsoft/images/pager/skipnext.gif\" border=\"0\" height=\"15\""+
		" alt=\"nächstes Jahr\"></a>"+
                "</td>\n</tr>\n"
	);

	var dt_current_day = new Date(dt_firstday);
	str_buffer += "<tr>\n";
        str_buffer += "<td align=\"right\"><font color=\"#666666\">Kw&nbsp;</font></td>"
	for (var n=0; n<7; n++)
		str_buffer += "	<td align=\"center\" bgcolor=\"#cCcCe4\">"+
		"<font color=\"#666666\" 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_display.getMonth() ||
		dt_current_day.getMonth() == dt_firstday.getMonth()) {
		str_buffer += "<tr>\n";
                str_buffer += "<td align=\"right\" bgcolor=\"#DCDCF4\"><font color=\"#666666\">"+(parseInt(strftime(dt_current_day,'%W'),0)+1)+"&nbsp;</font></td>"

		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() &&
                                    dt_current_day.getFullYear() == dt_datetime.getFullYear())
					str_buffer += "	<td bgcolor=\"#cBdAe5\" align=\"right\">";
				else if (dt_current_day.getDay() == 0)
					str_buffer += "	<td bgcolor=\"#FFB6C1\" align=\"right\">";
                                else if (dt_current_day.getDay() == 6)
					str_buffer += "	<td bgcolor=\"#FFc6d1\" align=\"right\">";
				else
					str_buffer += "	<td bgcolor=\"white\" align=\"right\">";

				if (dt_current_day.getMonth() == dt_display.getMonth())
					str_buffer += "<a href=\"javascript:window.opener.setdvalue('"+targetnameid+"','"+dt2dtstr(dt_current_day)+"');window.close();"+
					"\">"+
					"<font color=\"black\" face=\"tahoma, verdana\" size=\"2\">";
				else
					str_buffer += "<a href=\"javascript:window.opener.setdvalue('"+targetnameid+"','"+dt2dtstr(dt_current_day)+"');window.close();"+
					"\">"+
					"<font color=\"#bbbbbb\" face=\"tahoma, verdana\" size=\"2\">";
				str_buffer += dt_current_day.getDate()+"</font></a></td>\n";
				dt_current_day.setDate(dt_current_day.getDate()+1);
		}
		str_buffer += "</tr>\n";
	}
	str_buffer +=
		"</table>\n" +
		"</tr>\n</td>\n</table>\n"+
                "<table width=\"100%\" border=\"0\"><tr><td align=\"right\"><a href=\"javascript:window.close()\">[Kalender schliessen]</a></td></tr></table>" +
		"</body>\n" +
		"</html>\n";
        var width = 250;
        var height = 270;
        var left = (screen.width-width)/2;
        var top = (screen.height-height)/2;
        var params = ",HEIGHT="+height+",WIDTH="+width+",LEFT="+left+",TOP="+top;
	var vWinCal = window.open("", "PEKalender", "status=no,resizable=yes"+params);
	vWinCal.opener = self;
        vWinCal.focus();
	var calc_doc = vWinCal.document;
	calc_doc.write (str_buffer);
	calc_doc.close();
        oldcolor = str_target.style.backgroundColor;
        orgtarget = str_target;
        str_target.style.backgroundColor="#DCDCF4";
}

function str2dt (str_datetime) {
   var res = null;
   try{
     res = (checkDate(str_datetime));
   }catch(e){
     res = new Date();
   }
   if (res==null) res = new Date();
   return res;
}
function dt2dtstr (dt_datetime) {
  return formatDate(dt_datetime)
}
function dt2tmstr (dt_datetime) {
  return formatDate(dt_datetime)
}

