// Title: Tigra Calendar
	// URL: http://www.softcomplex.com/products/tigra_calend
	// Version: 3.3 (American date format)
	// Date: 09/01/2005 (mm/dd/yyyy)
	// Note: Permission given to use this script in ANY kind 
	//       of applications if
	//    header lines are left unchanged.
	// Note: Script consists of two files: calendar?.js and calendar.html

	// if two digit year input dates after this year considered 20 century.
	var NUM_CENTYEAR = 30;
	// is time input control required by default
	var BUL_TIMECOMPONENT = false;
	// are year scrolling buttons required by default
	var BUL_YEARSCROLL = true;

	var calendars = [];
	var RE_NUM = /^\-?\d+$/;

	function calendar2(obj_target) {
		// assigning methods
		this.gen_date = cal_gen_date2;
		this.gen_time = cal_gen_time2;
		this.gen_tsmp = cal_gen_tsmp2;
		this.prs_date = cal_prs_date2;
		this.prs_time = cal_prs_time2;
		this.prs_tsmp = cal_prs_tsmp2;
		this.popup    = cal_popup2;

		// validate input parameters
		if (!obj_target)
			return cal_error("Error calling the calendar: no target control specified");
		if (obj_target.value == null)
			return cal_error("Error calling the calendar: parameter specified is not valid target control");
		this.target = obj_target;
		this.time_comp = BUL_TIMECOMPONENT;
		this.year_scroll = BUL_YEARSCROLL;
	
		// register in global collections
		this.id = calendars.length;
		calendars[this.id] = this;
	}

	function cal_popup2 (str_datetime) {
		if (str_datetime) {
			this.dt_current = this.prs_tsmp(str_datetime);
		}
		else {
			this.dt_current = this.prs_tsmp(this.target.value);
			this.dt_selected = this.dt_current;
		}
		if (!this.dt_current) return;

		var obj_calwindow = window.open('calendar.html?datetime='+this.dt_current.valueOf()+ '&id=' + this.id, 'Calendar', 'width=200,height='+(this.time_comp ? 215 : 190)+',status=no,resizable=no,top=200,left=200,dependent=yes, alwaysRaised=yes');
		obj_calwindow.opener = window;
		obj_calwindow.focus();
	}

	// timestamp generating function
	function cal_gen_tsmp2 (dt_datetime) {
		return(this.gen_date(dt_datetime) + ' ' + 
		this.gen_time(dt_datetime));
	}

	// date generating function
	function cal_gen_date2 (dt_datetime) {
		return ((dt_datetime.getMonth() < 9 ? '0' : '') + 
			(dt_datetime.getMonth() + 1) + "-"+ 
			(dt_datetime.getDate() < 10 ? '0' : '') + 
			dt_datetime.getDate() + "-"+ 
			dt_datetime.getFullYear());
	}
	// time generating function
	function cal_gen_time2 (dt_datetime) {
		return ((dt_datetime.getHours() < 10 ? '0' : '') + 
			dt_datetime.getHours() + ":"+ 
			(dt_datetime.getMinutes() < 10 ? '0' : '') + 
			(dt_datetime.getMinutes()) + ":"+ 
			(dt_datetime.getSeconds() < 10 ? '0' : '') + 
			(dt_datetime.getSeconds()));
	}

	// timestamp parsing function
	function cal_prs_tsmp2 (str_datetime) {
		// if no parameter specified return current timestamp
		if (!str_datetime)
			return (new Date());

		// if positive integer treat as milliseconds from epoch
		if (RE_NUM.exec(str_datetime))
			return new Date(str_datetime);
		
		// else treat as date in string format
		var arr_datetime = str_datetime.split(' ');
		return this.prs_time(arr_datetime[1], 
		       this.prs_date(arr_datetime[0]));
	}

	// date parsing function
	function cal_prs_date2 (str_date) {

		var arr_date = str_date.split('-');

		if (arr_date.length != 3) 
			return alert ("Invalid date format: '" + 
			      str_date + "'.\nFormat accepted is dd-mm-yyyy.");
		
		if (!arr_date[1]) return alert ("Invalid date format: '" + 
		         str_date + "'.\nNo day of month value can be found.");
		
		if (!RE_NUM.exec(arr_date[1])) 
		     return alert ("Invalid day of month value: '" + 
		     arr_date[1] + "'.\nAllowed values are unsigned integers.");
		
		if (!arr_date[0]) return alert ("Invalid date format: '" + 
				str_date + "'.\nNo month value can be found.");
		
		if (!RE_NUM.exec(arr_date[0])) 
			return alert ("Invalid month value: '" + 
		    arr_date[0] + "'.\nAllowed values are unsigned integers.");
		
		if (!arr_date[2]) return alert ("Invalid date format: '" + 
			str_date + "'.\nNo year value can be found.");
	
		if (!RE_NUM.exec(arr_date[2])) 
			return alert ("Invalid year value: '" + 
		    arr_date[2] + "'.\nAllowed values are unsigned integers.");

		var dt_date = new Date();
		dt_date.setDate(1);

		if (arr_date[0] < 1 || arr_date[0] > 12) 
			return alert ("Invalid month value: '" + 
			arr_date[0] + "'.\nAllowed range is 01-12.");
		dt_date.setMonth(arr_date[0]-1);
	 
		if (arr_date[2] < 100) arr_date[2] = Number(arr_date[2]) + 
		   (arr_date[2] < NUM_CENTYEAR ? 2000 : 1900);
			dt_date.setFullYear(arr_date[2]);

		var dt_numdays = new Date(arr_date[2], arr_date[0], 0);
			dt_date.setDate(arr_date[1]);
	
		if (dt_date.getMonth() != (arr_date[0]-1)) 
			return alert ("Invalid day of month value: '" + 
			      arr_date[1] + "'.\nAllowed range is 01-"+
			      dt_numdays.getDate()+".");

		return (dt_date)
	}

	// time parsing function
	function cal_prs_time2 (str_time, dt_date) {

		if (!dt_date) return null;
		
		var arr_time = String(str_time ? str_time : '').split(':');

		if (!arr_time[0]) dt_date.setHours(0);
		else if (RE_NUM.exec(arr_time[0])) 
			if (arr_time[0] < 24) dt_date.setHours(arr_time[0]);
			else return cal_error ("Invalid hours value: '" + 
		            arr_time[0] + "'.\nAllowed range is 00-23.");
		else return cal_error ("Invalid hours value: '" + 
		   arr_time[0] + "'.\nAllowed values are unsigned integers.");
	
		if (!arr_time[1]) dt_date.setMinutes(0);
		else if (RE_NUM.exec(arr_time[1]))
			if (arr_time[1] < 60) dt_date.setMinutes(arr_time[1]);
			else return cal_error ("Invalid minutes value: '" + 
			       arr_time[1] + "'.\nAllowed range is 00-59.");
		else return cal_error ("Invalid minutes value: '" + 
		    arr_time[1] + "'.\nAllowed values are unsigned integers.");

		if (!arr_time[2]) dt_date.setSeconds(0);
		else if (RE_NUM.exec(arr_time[2]))
			if (arr_time[2] < 60) dt_date.setSeconds(arr_time[2]);
			else return cal_error ("Invalid seconds value: '" + 
			         arr_time[2] + "'.\nAllowed range is 00-59.");
		else return cal_error ("Invalid seconds value: '" + 
		    arr_time[2] + "'.\nAllowed values are unsigned integers.");

		dt_date.setMilliseconds(0);
		return dt_date;
	}

	function cal_error (str_message) {
		alert (str_message);
		return null;
	}