var ds_i_date = 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 ds_monthnames = [ 
'Janvier', 'Février', 'Mars', 'Avril', 'Mai', 'Juin', 
'Juillet', 'Aout', 'Septembre', 'Octobre', 'Novembre', 'Décembre' 
]; // You can translate it for your language. 

var ds_daynames = [ 
'Dim', 'Lun', 'Mar', 'Me', 'Jeu', 'Ven', 'Sam' 
]; // You can translate it for your language. 

// Calendar template 
function ds_template_main_above(t) { 
return '<table cellpadding="3" cellspacing="1" class="ds_tbl">' 
+ '<tr>' 
+ '<td class="ds_head" style="cursor: pointer" onclick="ds_py();">&lt;&lt;</td>' 
+ '<td class="ds_head" style="cursor: pointer" onclick="ds_pm();">&lt;</td>' 
+ '<td class="ds_head" style="cursor: pointer" onclick="ds_hi();" colspan="3">[Fermer]</td>' 
+ '<td class="ds_head" style="cursor: pointer" onclick="ds_nm();">&gt;</td>' 
+ '<td class="ds_head" style="cursor: pointer" onclick="ds_ny();">&gt;&gt;</td>' 
+ '</tr>' 
+ '<tr>' 
+ '<td colspan="7" class="ds_head">' + t + '</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) { 
return '<td class="ds_cell" onclick="ds_onclick(' + d + ',' + m + ',' + y + ')">' + d + '</td>'; 
// Define width the day row. 
} 

function ds_template_main_below() { 
return '</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 = 0; i < 7; i ++) { 
ds_echo (ds_template_day_row(ds_daynames[i])); 
} 
// 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(first_day)); 
} 
var j = first_day; 
for (i = 0; i < days; i ++) { 
// Today is sunday, make a new week. 
// If this sunday is the first day of the month, 
// we've made a new row for you already. 
if (j == 0 && !first_loop) { 
// New week!! 
ds_echo (ds_template_new_week()); 
} 
// Make a row of that day! 
ds_echo (ds_template_day(i + 1, 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(); 
// Scroll it into view. 
ds_ce.scrollIntoView(); 
} 

// A function to show the calendar. 
// When user click on the date, it will set the content of t. 
function ds_sh(t) { 
// Set the element to set... 
ds_element = t; 
// Make a new date, and set the current month and year. 
var ds_sh_date = new Date(); 
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 + 'px'; 
ds_ce.style.top = the_top + 'px'; 
// Scroll it into view. 
ds_ce.scrollIntoView(); 
} 

// Hide the calendar. 
function ds_hi() { 
ds_ce.style.display = 'none'; 
} 

// 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. 
// Increase the current year, and set the current month to January. 
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. 
// Decrease the current year, and set the current month to December. 
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); 
// YYYY-MM-DD 
// return y + '-' + m2 + '-' + d2; 
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)); 
} 
}