function get_calendar() {
	try {
	  return (document.getElementById("calendar")) || document.all["calendar"];
	}
	catch(e){return null;}
}

function findPos_calendar(obj) {
	var coords = {x: 0, y: 0}; 
	if (obj.offsetParent) {
		coords.x = obj.offsetLeft;
		coords.y = obj.offsetTop;
		while (obj = obj.offsetParent) {
			coords.x += obj.offsetLeft;
			coords.y += obj.offsetTop;
		}
	}
	return coords;
}

function hide_calendar() {
	var winbox = get_calendar();
	if(winbox == null)
		return;

	winbox.style.visibility = "hidden";
  testDurataNoleggio();
  return;
}

function show_calendar(str_target, str_dateobj, lingua) {

  var winbox = get_calendar();
  if(winbox != null){
    if(winbox.style.visibility == "visible") {

      hide_calendar();
      return;
    }

    var str_datetime = str_dateobj.value;
    var coo = findPosCalendar(str_dateobj);

   if (lingua == ''){
	lingua = 'it';
    }
    gen_calendar(str_target, str_datetime, coo.x, coo.y,lingua);
  }
}

function gen_calendarMounth(str_target,dt_month,x,y,lingua) {
  
  var s = "\"javascript:gen_calendar('" + str_target + "', '" + dt2dtstr(dt_month) + "'," + x + "," + y + ",'"+lingua+"');\"";
  return s;
}

function gen_calendar(str_target, str_datetime, x, y, lingua) {

	if (lingua == 'it'){	
		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 mese_next = 'mese successivo';
		var mese_prev = 'mese precedente';
	}else{
		var arr_months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
		var week_days = ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"];
		var mese_next = 'next month';
		var mese_prev = 'previous month';

	}

	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);

	var winbox = get_calendar();
	if(winbox == null){
		alert("help");
	}


  var dt_to_day = new Date();

	// html generation (feel free to tune it for your particular application)
	// print calendar header

	if ((dt_to_day.getMonth()<=dt_prev_month.getMonth())||
	    (dt_to_day.getYear()<dt_prev_month.getYear())){
		strPrevious = gen_calendarMounth(str_target,dt_prev_month,x,y,lingua);
	}else{
		strPrevious = "#";
	}

	var str_buffer = new String (
		"<table id=\"clsCalendar\" cellspacing=\"0\" border=\"0\" >\n"+
		"<tr><td>\n"+

		"<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
		"<tr>\n" +
    
    "<td><a href=" + strPrevious + ">" +
		"<img src=\"img/icons/prev.gif\" width=\"16\" height=\"16\" border=\"0\"" + "alt=\""+mese_prev+"\"></a></td>\n" + 
		"<td colspan=\"5\">" + arr_months[dt_datetime.getMonth()] + " " + dt_datetime.getFullYear() + "</td>\n" +
		
    "<td align=\"right\"><a href=" + gen_calendarMounth(str_target,dt_next_month,x,y,lingua) + ">" +
		"<img src=\"img/icons/next.gif\" width=\"16\" height=\"16\" border=\"0\"" + " alt=\""+mese_next+"\"></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 class=\"weekdays\">"+ 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()){
	  
//alert(dt_current_day.getDate()+"-"+dt_current_day.getMonth()+"/"+dt_datetime.getDate()+"-"+dt_datetime.getMonth()+"/"+dt_to_day.getDate()+"-"+dt_to_day.getMonth());

	   if ((dt_current_day.getDate() == dt_to_day.getDate()) &&
             (dt_current_day.getMonth() == dt_to_day.getMonth()) &&
             (dt_current_day.getYear() == dt_to_day.getYear())){

          // print current date
          str_buffer += " <td class=\"currentdate\">";
        }else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6){
          // weekend days
          str_buffer += " <td class=\"weekendday\">";
        }else{
		// print working days of current month
	    str_buffer += " <td class=\"currentmonth\">";

	  }
        //if (dt_current_day.getDate() >= dt_to_day.getDate() && dt_current_day.getMonth() == dt_to_day.getMonth())
          // print days of current month
        //  str_buffer += "<a class=\"selcurrentmonth\" href=\"javascript:" + str_target + ".value='" + dt2dtstr(dt_current_day) + "'; hide_calendar();\">" + dt_current_day.getDate()+"</a>";
        //else if (dt_current_day > dt_to_day)
	  
	  if (dt_current_day.getMonth() < dt_to_day.getMonth() && dt_current_day.getYear() <= dt_to_day.getYear())

		str_buffer += dt_current_day.getDate();

	  else if (dt_current_day.getMonth() == dt_to_day.getMonth() && dt_current_day.getDate() < dt_to_day.getDate() && dt_current_day.getYear() <= dt_to_day.getYear() )

		str_buffer += dt_current_day.getDate();
	  else if (dt_current_day.getMonth() == dt_datetime.getMonth())

					// print days of other months
          str_buffer += "<a class=\"selothermonth\" href=\"javascript:" + str_target + ".value='"+dt2dtstr(dt_current_day)+"'; hide_calendar();\">" + dt_current_day.getDate()+"</a>";
        else
          //str_buffer += dt_current_day.getDate();
	    str_buffer += "";
          
				str_buffer += "</td>\n";
				dt_current_day.setDate(dt_current_day.getDate()+1);
		}
		// print row footer
		str_buffer += "</tr>\n";
	}

	// print calendar footer
	str_buffer += "</table></tr></td></tr></table>";


	winbox.style.left = x;//str_dateobj.offsetLeft + 10;
	winbox.style.top  = y + 25;;//str_dateobj.offsetTop + 37;
	winbox.innerHTML = str_buffer;
	winbox.style.visibility = "visible";

/*
	var vWinCal = window.open("", "Calendar", 
		"width=200,height=250,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));
}

function dt2dtstr (dt_datetime) {
  var month = dt_datetime.getMonth()+1;
  var day = dt_datetime.getDate();
  if(day<10) day = "0" + day;
  if(month<10) month= "0" + month;

	return (new String (day + "-" + month + "-" + dt_datetime.getFullYear()));
}

function dt2tmstr (dt_datetime) {
	return (new String (
			dt_datetime.getHours()+":"+dt_datetime.getMinutes()+":"+dt_datetime.getSeconds()));
}

function findPosCalendar(obj) {
	var coords = {x: 0, y: 0}; 
	if (obj.offsetParent) {
		coords.x = obj.offsetLeft;
		coords.y = obj.offsetTop;
		while (obj = obj.offsetParent) {
			coords.x += obj.offsetLeft;
			coords.y += obj.offsetTop;
		}
	}
	return coords;
}

function testDurataNoleggio()
{
  var e = getElement("parid");
  if (e.value == "1") {
    var wbx = getElement("ctrl_supkm");
    wbx.style.visibility = "hidden";
    var kmill = getElement("KMILLIMITATO");
    kmill.checked=true;
  }
  else
    calcoloDurataNoleggio();
}

function calcoloDurataNoleggio()
{
  var e = null;
  var kmill = null;

  e = getElement("tp_data_inizio");
  var nol_i = str2dt(e.value);
  e = getElement("tp_data_fine");
  var nol_f = str2dt(e.value);
  kmill = getElement("KMILLIMITATO");

  var ng = (nol_f-nol_i)/86400000;

  e = getElement("tp_km");
  var wbx = getElement("ctrl_km");
  if(ng >= 1) {
    wbx.style.visibility = "visible";
    wbx.style.visibility = "visible";

    e.value="";
    //e.disabled=false;
  }
  else if(ng < 1) {

    wbx.style.visibility = "hidden";
    kmill.checked=false;
    //e.value=ng*100;
	e.value="";
    //e.disabled=true;
  }
  else {
    wbx.style.visibility = "hidden";
    e.value="";
    //e.disabled=true;
  }
  
}