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;
        }
        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;
        }
        // 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.setDate(1);
                ds_dc_date.setMonth(m-1);
                ds_dc_date.setFullYear(y);

        	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 tab_jour=new Array("Dimanche", "Lundi", "Mardi", "Mercredi", "Jeudi", "Vendredi", "Samedi");
                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);        	
        	// I don't know how should we display it, just alert it to user.
        	} else {
        		alert (ds_format_date(d, m, y));
        	}
        }