// Tigra Calendar v4.0.4 (10/23/2009) American (mm/dd/yyyy)
// http://www.softcomplex.com/products/tigra_calendar/
// Public Domain Software... You're welcome.

// date parsing function
function f_tcalParseDate (s_date) {

	var re_date = /^\s*(\d{1,2})\-(\d{1,2})\-(\d{2,4})\s*$/;
	if (!re_date.exec(s_date))
		return alert ("Invalid date: '" + s_date + "'.\nAccepted format is dd-mm-yyyy.")
	var n_day = Number(RegExp.$1),
		n_month = Number(RegExp.$2),
		n_year = Number(RegExp.$3);

	if (n_year < 100)
		n_year += (n_year < this.a_tpl.centyear ? 2000 : 1900);
	if (n_month < 1 || n_month > 12)
		return alert ("Invalid month value: '" + n_month + "'.\nAllowed range is 01-12.");
	var d_numdays = new Date(n_year, n_month, 0);
	if (n_day > d_numdays.getDate())
		return alert("Invalid day of month value: '" + n_day + "'.\nAllowed range for selected month is 01 - " + d_numdays.getDate() + ".");

	return new Date (n_year, n_month - 1, n_day);
}
// date generating function
function f_tcalGenerDate (d_date) {
	return (
		(d_date.getDate() < 10 ? '0' : '') + d_date.getDate() + "-"
		+ (d_date.getMonth() < 9 ? '0' : '') + (d_date.getMonth() + 1) + "-"
		+ d_date.getFullYear()
	);
}

// implementation
function tcal (a_cfg, a_tpl) {

	// apply default template if not specified
	if (!a_tpl)
		a_tpl = A_TCALDEF;

	// register in global collections
	if (!window.A_TCALS)
		window.A_TCALS = [];
	if (!window.A_TCALSIDX)
		window.A_TCALSIDX = [];

	this.s_id = a_cfg.id ? a_cfg.id : A_TCALS.length;
	window.A_TCALS[this.s_id] = this;
	window.A_TCALSIDX[window.A_TCALSIDX.length] = this;

	// assign methods
	this.f_show = f_tcalShow;
	this.f_hide = f_tcalHide;
	this.f_toggle = f_tcalToggle;
	this.f_update = f_tcalUpdate;
	this.f_relDate = f_tcalRelDate;
	this.f_parseDate = f_tcalParseDate;
	this.f_generDate = f_tcalGenerDate;

	// create calendar icon
	this.s_iconId = 'tcalico_' + this.s_id;
	this.e_icon = f_getElement(this.s_iconId);
	if (!this.e_icon) {
		document.write('<a href="#" onclick="A_TCALS[\'' + this.s_id + '\'].f_toggle();return false"><img src="' + a_tpl.imgpath + 'cal.gif" id="' + this.s_iconId + '" class="tcalIcon" alt=""></a>');
		this.e_icon = f_getElement(this.s_iconId);
	}
	// save received parameters
	this.a_cfg = a_cfg;
	this.a_tpl = a_tpl;
}

function f_tcalShow (d_date) {
	// find input field
	this.toset = new Date();

	var elem_den = document.getElementById(this.a_cfg.den_id);
	var elem_mesiacrok = document.getElementById(this.a_cfg.mesiacrok_id);

	if (elem_den != null && elem_mesiacrok != null) {
		var den = elem_den.options[elem_den.selectedIndex].value;
		var mesiacrok = elem_mesiacrok.options[elem_mesiacrok.selectedIndex].value;

		if (den != "" && mesiacrok != "") {
			var rok = parseInt(mesiacrok.substring(0, 4), 10);
			var mesiac = parseInt(mesiacrok.substring(4, 6), 10) - 1;

			this.toset = new Date(rok, mesiac, den, 12);
		}
	}

	// dynamically create HTML elements if needed
	this.e_div = f_getElement('tcal');
	if (!this.e_div) {
		this.e_div = document.createElement("DIV");
		this.e_div.id = 'tcal';
		document.body.appendChild(this.e_div);
	}
	this.e_shade = f_getElement('tcalShade');
	if (!this.e_shade) {
		this.e_shade = document.createElement("DIV");
		this.e_shade.id = 'tcalShade';
		document.body.appendChild(this.e_shade);
	}
	this.e_iframe =  f_getElement('tcalIF');
	if (b_ieFix && !this.e_iframe) {
		this.e_iframe = document.createElement("IFRAME");
		this.e_iframe.style.filter = 'alpha(opacity=0)';
		this.e_iframe.id = 'tcalIF';
		this.e_iframe.src = this.a_tpl.imgpath + 'pixel.gif';
		document.body.appendChild(this.e_iframe);
	}

	// hide all calendars
	f_tcalHideAll();

	// generate HTML and show calendar
	this.e_icon = f_getElement(this.s_iconId);
	if (!this.f_update())
		return;

	this.e_div.style.visibility = 'visible';
	this.e_shade.style.visibility = 'visible';
	if (this.e_iframe)
		this.e_iframe.style.visibility = 'visible';

	this.b_visible = true;
}

function f_tcalHide (n_date) {
	if (n_date) {
		var elem_den = document.getElementById(this.a_cfg.den_id);
		var elem_mesiacrok = document.getElementById(this.a_cfg.mesiacrok_id);

		if (elem_den != null && elem_mesiacrok != null) {
			var dt = new Date(n_date);
			var day = dt.getDate();
			var month = dt.getMonth() + 1;
			if (month < 10)
				month = "0" + month;
			var year = dt.getFullYear();
			var monthyear = year.toString() + month.toString();

			for (var i=0; i<elem_den.options.length; i++) {
				if (elem_den.options[i].value == day) {
					elem_den.selectedIndex = i;
					break;
				}
			}
			for (var i=0; i<elem_mesiacrok.options.length; i++) {
				if (elem_mesiacrok.options[i].value == monthyear) {
					elem_mesiacrok.selectedIndex = i;
					break;
				}
			}
			if (this.a_cfg.what == "od")
				NastavMesiacRok(elem_mesiacrok);
			else if (this.a_cfg.what == "do")
				NastavMesiacDo(elem_den);
		}
	}

	// no action if not visible
	if (!this.b_visible)
		return;

	// hide elements
	if (this.e_iframe)
		this.e_iframe.style.visibility = 'hidden';
	if (this.e_shade)
		this.e_shade.style.visibility = 'hidden';
	this.e_div.style.visibility = 'hidden';

	this.b_visible = false;
}

function f_tcalToggle () {
	return this.b_visible ? this.f_hide() : this.f_show();
}

function f_tcalUpdate (d_date) {
	var d_today = f_tcalResetTime(new Date());
	var d_selected = this.toset;

	// figure out date to display
	if (!d_date)
		d_date = this.toset;
	else if (typeof(d_date) == 'number')
		// get from number
		d_date = f_tcalResetTime(new Date(d_date));
	else if (typeof(d_date) == 'string')
		// parse from string
		d_date = this.f_parseDate(d_date);

	if (!d_date) return false;

	// first date to display
	var d_firstday = new Date(d_date);
	d_firstday.setDate(1);
	d_firstday.setDate(1 - (7 + d_firstday.getDay() - this.a_tpl.weekstart) % 7);

	var a_class, s_html = '<table class="ctrl"><tbody><tr>'
		+ (this.a_tpl.yearscroll ? '<td' + this.f_relDate(d_date, -1, 'y') + '><img src="' + this.a_tpl.imgpath + 'prev_year.gif" alt=""></td>' : '')
		+ '<td' + this.f_relDate(d_date, -1) + '><img src="' + this.a_tpl.imgpath + 'prev_mon.gif" alt=""></td><th>'
		+ this.a_tpl.months[d_date.getMonth()] + ' ' + d_date.getFullYear()
			+ '</th><td' + this.f_relDate(d_date, 1) + '><img src="' + this.a_tpl.imgpath + 'next_mon.gif" alt=""></td>'
		+ (this.a_tpl.yearscroll ? '<td' + this.f_relDate(d_date, 1, 'y') + '><img src="' + this.a_tpl.imgpath + 'next_year.gif" alt=""></td></td>' : '')
		+ '</tr></tbody></table><table><tbody><tr class="wd">';

	// print weekdays titles
	for (var i = 0; i < 7; i++)
		s_html += '<th>' + this.a_tpl.weekdays[(this.a_tpl.weekstart + i) % 7] + '</th>';
	s_html += '</tr>' ;

	// print calendar table
	var n_date, n_month, d_current = new Date(d_firstday);
	while (d_current.getMonth() == d_date.getMonth() ||
		d_current.getMonth() == d_firstday.getMonth()) {

		// print row heder
		s_html +='<tr>';
		for (var n_wday = 0; n_wday < 7; n_wday++) {
			var dis = false;
			a_class = [];
			n_date = d_current.getDate();
			n_month = d_current.getMonth();

			var dd = n_date < 10 ? "0" + n_date : n_date;
			var mm = n_month + 1;
			var mm = mm < 10 ? "0" + mm : mm;
			var cc = d_current.getFullYear().toString() + mm.toString() + dd.toString();
			cc = parseInt(cc);

			// other month
			if (d_current.getMonth() != d_date.getMonth())
				a_class[a_class.length] = 'othermonth';
			// weekend
			if (d_current.getDay() == 0 || d_current.getDay() == 6)
				a_class[a_class.length] = 'weekend';
			// today
			if (d_current.valueOf() == d_today.valueOf())
				a_class[a_class.length] = 'today';
			// selected
			if (d_current.valueOf() == d_selected.valueOf())
				a_class[a_class.length] = 'selected';
			// past
			if (cc < this.a_cfg.valid) {
				a_class[a_class.length] = 'disabled';
				dis = true;
			}

			s_html += '<td';
			if (!dis)
				s_html += ' onclick="A_TCALS[\'' + this.s_id + '\'].f_hide(' + d_current.valueOf() + ')"';
			s_html += (a_class.length ? ' class="' + a_class.join(' ') + '">' : '>') + n_date + '</td>';

			d_current.setDate(++n_date);
		}
		// print row footer
		s_html +='</tr>';
	}
	s_html +='</tbody></table>';

	// update HTML, positions and sizes
	this.e_div.innerHTML = s_html;

	var n_width  = this.e_div.offsetWidth;
	var n_height = this.e_div.offsetHeight;
	var n_top  = f_getPosition (this.e_icon, 'Top') + this.e_icon.offsetHeight;
	var n_left = f_getPosition (this.e_icon, 'Left') - n_width + this.e_icon.offsetWidth;

	//var n_top  = f_getPosition (this.e_icon, 'Top');
	//var n_left = f_getPosition (this.e_icon, 'Left') + this.e_icon.offsetWidth + 3;

	if (n_left < 0) n_left = 0;

	this.e_div.style.left = n_left + 'px';
	this.e_div.style.top  = n_top + 'px';

	this.e_shade.style.width = (n_width + 8) + 'px';
	this.e_shade.style.left = (n_left - 1) + 'px';
	this.e_shade.style.top = (n_top - 1) + 'px';
	this.e_shade.innerHTML = b_ieFix
		? '<table><tbody><tr><td rowspan="2" colspan="2" width="6"><img src="' + this.a_tpl.imgpath + 'pixel.gif"></td><td width="7" height="7" style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'' + this.a_tpl.imgpath + 'shade_tr.png\', sizingMethod=\'scale\');"><img src="' + this.a_tpl.imgpath + 'pixel.gif"></td></tr><tr><td height="' + (n_height - 7) + '" style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'' + this.a_tpl.imgpath + 'shade_mr.png\', sizingMethod=\'scale\');"><img src="' + this.a_tpl.imgpath + 'pixel.gif"></td></tr><tr><td width="7" style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'' + this.a_tpl.imgpath + 'shade_bl.png\', sizingMethod=\'scale\');"><img src="' + this.a_tpl.imgpath + 'pixel.gif"></td><td style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'' + this.a_tpl.imgpath + 'shade_bm.png\', sizingMethod=\'scale\');" height="7" align="left"><img src="' + this.a_tpl.imgpath + 'pixel.gif"></td><td style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'' + this.a_tpl.imgpath + 'shade_br.png\', sizingMethod=\'scale\');"><img src="' + this.a_tpl.imgpath + 'pixel.gif"></td></tr><tbody></table>'
		: '<table><tbody><tr><td rowspan="2" width="6"><img src="' + this.a_tpl.imgpath + 'pixel.gif"></td><td rowspan="2"><img src="' + this.a_tpl.imgpath + 'pixel.gif"></td><td width="7" height="7"><img src="' + this.a_tpl.imgpath + 'shade_tr.png"></td></tr><tr><td background="' + this.a_tpl.imgpath + 'shade_mr.png" height="' + (n_height - 7) + '"><img src="' + this.a_tpl.imgpath + 'pixel.gif"></td></tr><tr><td><img src="' + this.a_tpl.imgpath + 'shade_bl.png"></td><td background="' + this.a_tpl.imgpath + 'shade_bm.png" height="7" align="left"><img src="' + this.a_tpl.imgpath + 'pixel.gif"></td><td><img src="' + this.a_tpl.imgpath + 'shade_br.png"></td></tr><tbody></table>';

	if (this.e_iframe) {
		this.e_iframe.style.left = n_left + 'px';
		this.e_iframe.style.top  = n_top + 'px';
		this.e_iframe.style.width = (n_width + 6) + 'px';
		this.e_iframe.style.height = (n_height + 6) +'px';
	}
	return true;
}

function f_getPosition (e_elemRef, s_coord) {
	var n_pos = 0, n_offset,
		e_elem = e_elemRef;

	while (e_elem) {
		n_offset = e_elem["offset" + s_coord];
		n_pos += n_offset;
		e_elem = e_elem.offsetParent;
	}
	// margin correction in some browsers
	if (b_ieMac)
		n_pos += parseInt(document.body[s_coord.toLowerCase() + 'Margin']);
	else if (b_safari)
		n_pos -= n_offset;

	e_elem = e_elemRef;
	while (e_elem != document.body) {
		n_offset = e_elem["scroll" + s_coord];
		if (n_offset && e_elem.style.overflow == 'scroll')
			n_pos -= n_offset;
		e_elem = e_elem.parentNode;
	}
	return n_pos;
}

function f_tcalRelDate (d_date, d_diff, s_units) {
	var s_units = (s_units == 'y' ? 'FullYear' : 'Month');
	var d_result = new Date(d_date);
	d_result['set' + s_units](d_date['get' + s_units]() + d_diff);
	if (d_result.getDate() != d_date.getDate())
		d_result.setDate(0);
	return ' onclick="A_TCALS[\'' + this.s_id + '\'].f_update(' + d_result.valueOf() + ')"';
}

function f_tcalHideAll () {
	if (!window.A_TCALSIDX) return;
	for (var i = 0; i < window.A_TCALSIDX.length; i++)
		window.A_TCALSIDX[i].f_hide();
}	

function f_tcalResetTime (d_date) {
	d_date.setHours(12);
	d_date.setMinutes(0);
	d_date.setSeconds(0);
	d_date.setMilliseconds(0);
	return d_date;
}

f_getElement = document.all ?
	function (s_id) { return document.all[s_id] } :
	function (s_id) { return document.getElementById(s_id) };

if (document.addEventListener)
	window.addEventListener('scroll', f_tcalHideAll, false);
if (window.attachEvent)
	window.attachEvent('onscroll', f_tcalHideAll);

// global variables
var s_userAgent = navigator.userAgent.toLowerCase(),
	re_webkit = /WebKit\/(\d+)/i;
var b_mac = s_userAgent.indexOf('mac') != -1,
	b_ie5 = s_userAgent.indexOf('msie 5') != -1,
	b_ie6 = s_userAgent.indexOf('msie 6') != -1 && s_userAgent.indexOf('opera') == -1;
var b_ieFix = b_ie5 || b_ie6,
	b_ieMac  = b_mac && b_ie5,
	b_safari = b_mac && re_webkit.exec(s_userAgent) && Number(RegExp.$1) < 500;