// Project: Dynamic Date Selector (DtTvB) - 2006-03-16
// Script featured on JavaScript Kit- http://www.javascriptkit.com
function valide(prov,dest,du,au,nom_form)
{
var Provenance, Destination, Date_debut, Date_fin, Option_1, Option_2, Option_3, action, mess;
	
	if (prov != 'nul') {
		mess='Veuillez saisir une ville de départ';
		Provenance=document.forms[nom_form].elements[prov].value;
		if (Provenance == '') {
			alert(mess);
			return false;					
		}						
		if (Provenance=='-> ville de départ') {
			alert(mess);
			return false;					
		}
		if (Provenance==' Prise en charge') {
			alert(mess);
			return false;					
		}		
	}
	if (dest != 'nul') {
		mess='Veuillez saisir une ville de destination';
		Destination=document.forms[nom_form].elements[dest].value;
		if (Destination=='') {
			alert(mess);
			return false;				
		}						
		if (Destination=='-> ville d arrivée')
		{
			alert(mess);
			return false;				
		}	
		if (Destination==' ville')
		{
			alert(mess);
			return false;				
		}		
	}	
	if (du != 'nul') {
		mess='Veuillez choisir une date de debut';
		Date_debut=document.forms[nom_form].elements[du].value;
		if (Date_debut=='')	{
			alert(mess);
			return false;					
		}				
	}	
	if (au != 'nul') {
		Date_fin=document.forms[nom_form].elements[au].value;
		if (Date_fin=='') {
			alert(mess);
			return false;					
		}			
	}
return true;
}

var ds_i_date = new Date();
var date_tmp = new Date();
var date_mini = new Date();
ds_c_month = ds_i_date.getMonth() + 1;
ds_c_year = ds_i_date.getFullYear();

// Get Element By Id
function ds_getel(id) {
	return document.getElementById(id);
}

// Get the left and the top of the element.
function ds_getleft(el) {
	var tmp = el.offsetLeft;
	el = el.offsetParent
	while(el) {
		tmp += el.offsetLeft;
		el = el.offsetParent;
	}
	return tmp;
}
function ds_gettop(el) {
	var tmp = el.offsetTop;
	el = el.offsetParent
	while(el) {
		tmp += el.offsetTop;
		el = el.offsetParent;
	}
	return tmp;
}

// Output Element
var ds_oe = ds_getel('ds_calclass');
// Container
var ds_ce = ds_getel('ds_conclass');

// Output Buffering
var ds_ob = ''; 
function ds_ob_clean() {
	ds_ob = '';
}
function ds_ob_flush() {
	ds_oe.innerHTML = ds_ob;
	ds_ob_clean();
}
function ds_echo(t) {
	ds_ob += t;
}

var ds_element; // Text Element...
var calque_a_masquer; // nom du calque

var ds_monthnames = [
'Jan', 'Fév', 'Mars', 'Avr', 'Mai', 'Juin',
'Juil', 'Août', 'Sept', 'Oct', 'Nov', 'Déc'
]; // You can translate it for your language.

var ds_daynames = [
'Di', 'Lu', 'Ma', 'Me', 'Je', 'Ve', 'Sa'
]; // You can translate it for your language.

// Calendar template
function ds_template_main_above(t) {
	return '<table cellspacing="0" class="ds_tbl"  width="130" >'
	     + '<tr>'
		 + '<td class="ds_head"><a href="#" onclick="ds_pm();">&lt;&lt;</A></td>'
		 + '<td colspan="5" class="ds_subhead">' + t + '</td>'
		 + '<td class="ds_head"><a href="#" onclick="ds_nm();">&gt;&gt;</A></td>'
		 + '</tr>'
		 + '<tr>';
}

function ds_template_day_row(t) {
	return '<td class="ds_subhead">' + t + '</td>';
	// Define width in CSS, XHTML 1.0 Strict doesn't have width property for it.
}

function ds_template_new_week() {
	return '</tr><tr>';
}

function ds_template_blank_cell(colspan) {
	return '<td colspan="' + colspan + '"></td>'
}

function ds_template_day(d, m, y) {

	date_tmp.setDate(d+1);
	date_tmp.setMonth(m-1);
	date_tmp.setYear(y);
	d = d+1
	if (date_mini <= date_tmp) {
		return '<td class="ds_cell" align="center" ><a href="#" onclick="ds_onclick(' + d + ',' + m + ',' + y + ')">' + d + '</a></td>';
	} else {
		return '<td class="ds_cell" style="color: #999999;" align="center"><s>' + d + '</s></td>'
	}
	// Define width the day row.
}

function ds_template_main_below() {
	return '</tr>'
		 + '<tr>'
		 + '<td class="ds_cell" align="center" colspan="7" ><a href="#" onclick="ds_hi();" >[Fermer]</A></td>'
		 + '</tr>'
	     + '</table>';
}

// This one draws calendar...
function ds_draw_calendar(m, y) {
	// First clean the output buffer.
	ds_ob_clean();
	// Here we go, do the header
	ds_echo (ds_template_main_above(ds_monthnames[m - 1] + ' ' + y));
	for (i = 1; i < 7; i ++) {
		ds_echo (ds_template_day_row(ds_daynames[i]));
	}
	ds_echo (ds_template_day_row(ds_daynames[0]));
	// Make a date object.
	var ds_dc_date = new Date();
	ds_dc_date.setMonth(m - 1);
	ds_dc_date.setFullYear(y);
	ds_dc_date.setDate(1);
	if (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12) {
		days = 31;
	} else if (m == 4 || m == 6 || m == 9 || m == 11) {
		days = 30;
	} else {
		days = (y % 4 == 0) ? 29 : 28;
	}
	var first_day = ds_dc_date.getDay();
	var first_loop = 1;
	// Start the first week
	ds_echo (ds_template_new_week());
	// If sunday is not the first day of the month, make a blank cell...
	if (first_day == 0) {
		ds_echo (ds_template_blank_cell(6));
	} else if (first_day != 1) {
	ds_echo (ds_template_blank_cell(first_day-1));
	}
	var j = first_day;
	for (i = 0; i < days; i ++) {
		// Today is sunday, make a new week.
		if (j == 1 && !first_loop) {
			// New week!!
			ds_echo (ds_template_new_week());
		}
		// Make a row of that day!
		ds_echo (ds_template_day(i, m, y));
		// This is not first loop anymore...
		first_loop = 0;
		// What is the next day?
		j ++;
		j %= 7;
	}
	// Do the footer
	ds_echo (ds_template_main_below());
	// And let's display..
	ds_ob_flush();
}

// When user click on the date, it will set the content of t.
function ds_sh(t, c, mini) {
	// Set the element to set...

	ds_element = t;
	if (c != 'calque') {
		calque_a_masquer = c;
		document.getElementById(calque_a_masquer).style.display = 'none';
	}
	// Make a new date, and set the current month and year.
	var ds_sh_date = new Date();
	
	if (t.value != '') {
		ds_c_month = t.value.substring(3,5);
		ds_c_year = t.value.substring(6,10);
	} else {
		ds_c_month = ds_sh_date.getMonth() + 1;
		ds_c_year = ds_sh_date.getFullYear();
	}
	// Draw the calendar
	ds_draw_calendar(ds_c_month, ds_c_year);
	// To change the position properly, we must show it first.
	ds_ce.style.display = '';
	// Move the calendar container!
	the_left = ds_getleft(t);
	the_top = ds_gettop(t) + t.offsetHeight;
	ds_ce.style.left = (the_left-35) + 'px';
	ds_ce.style.top = the_top + 'px';

}

// Hide the calendar.
function ds_hi(c) {
	ds_ce.style.display = 'none';
	if (c != undefined) {
		calque_a_masquer = c;
	}
	if (calque_a_masquer != undefined) {
		document.getElementById(calque_a_masquer).style.display='block'
	}
}

// Moves to the next month...
function ds_nm() {
	// Increase the current month.
	ds_c_month ++;
	// We have passed December, let's go to the next year.
	if (ds_c_month > 12) {
		ds_c_month = 1; 
		ds_c_year++;
	}
	// Redraw the calendar.
	ds_draw_calendar(ds_c_month, ds_c_year);
}

// Moves to the previous month...
function ds_pm() {
	ds_c_month = ds_c_month - 1; // Can't use dash-dash here, it will make the page invalid.
	// We have passed January, let's go back to the previous year.
	if (ds_c_month < 1) {
		ds_c_month = 12; 
		ds_c_year = ds_c_year - 1; // Can't use dash-dash here, it will make the page invalid.
	}
	// Redraw the calendar.
	ds_draw_calendar(ds_c_month, ds_c_year);
}

// Moves to the next year...
function ds_ny() {
	// Increase the current year.
	ds_c_year++;
	// Redraw the calendar.
	ds_draw_calendar(ds_c_month, ds_c_year);
}

// Moves to the previous year...
function ds_py() {
	// Decrease the current year.
	ds_c_year = ds_c_year - 1; // Can't use dash-dash here, it will make the page invalid.
	// Redraw the calendar.
	ds_draw_calendar(ds_c_month, ds_c_year);
}

// Format the date to output.
function ds_format_date(d, m, y) {
	// 2 digits month.
	m2 = '00' + m;
	m2 = m2.substr(m2.length - 2);
	// 2 digits day.
	d2 = '00' + d;
	d2 = d2.substr(d2.length - 2);
	// DD-MM-YYYY
	return d2 + '/' + m2 + '/' + y;
}

// When the user clicks the day.
function ds_onclick(d, m, y) {
	// Hide the calendar.
	ds_hi();
	// Set the value of it, if we can.
	if (typeof(ds_element.value) != 'undefined') {
		ds_element.value = ds_format_date(d, m, y);
	// Maybe we want to set the HTML in it.
	} else if (typeof(ds_element.innerHTML) != 'undefined') {
		ds_element.innerHTML = ds_format_date(d, m, y);
	// I don't know how should we display it, just alert it to user.
	} else {
		alert (ds_format_date(d, m, y));
	}
}