var months = new Array("Enero", "Febrero", "Marzo", "April", "Mayo", "Junio", "Julio", "Agosto", "Septiembre", "Octubre", "Noviembre", "Diciembre");
var daysInMonth = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
var days = new Array("D", "L", "M", "Mi", "J", "V", "S");

today = new getToday();
var element_id;

function getDays(month, year)
{
// Test for leap year when February is selected.
if (1 == month)
return ((0 == year % 4) && (0 != (year % 100))) ||
(0 == year % 400) ? 29 : 28;
else
return daysInMonth[month];
}

function getToday()
{
// Generate today's date.
this.now = new Date();
this.year = this.now.getFullYear() ; // Returned year XXXX
this.month = this.now.getMonth();
this.day = this.now.getDate();
}


function newCalendar()
{
var parseYear = parseInt(document.all.year  [document.all.year.selectedIndex].text);

var newCal = new Date(parseYear , document.all.month.selectedIndex, 1);
var day = -1;
var startDay = newCal.getDay();
var daily = 0;

today = new getToday(); // 1st call
if ((today.year == newCal.getFullYear() ) &&   (today.month == newCal.getMonth()))
day = today.day;
// Cache the calendar table's tBody section, dayList.
var tableCal = document.all.calendar.tBodies.dayList;

var intDaysInMonth =
getDays(newCal.getMonth(), newCal.getFullYear() );

for (var intWeek = 0; intWeek < tableCal.rows.length;  intWeek++)
for (var intDay = 0;
intDay < tableCal.rows[intWeek].cells.length;
intDay++)
{
var cell = tableCal.rows[intWeek].cells[intDay];

// Start counting days.
if ((intDay == startDay) && (0 == daily))
daily = 1;

// Highlight the current day.
cell.style.color = (day == daily) ? "red" : "";
if(day == daily)
{
document.all.todayday.innerText= "Today: " +  day + "/" +
(newCal.getMonth()+1) + "/" + newCal.getFullYear() ;
}
// Output the day number into the cell.
if ((daily > 0) && (daily <= intDaysInMonth))
cell.innerText = daily++;
else
cell.innerText = "";
}

}

function getTodayDay()
{
document.all[element_id].value = today.day + "/" + (today.month+1) +
"/" + today.year;
//document.all.calendar.style.visibility="hidden";
document.all.calendar.style.display="none";
document.all.year.selectedIndex =100;
document.all.month.selectedIndex = today.month;
}

function getDate()
{
// This code executes when the user clicks on a day
// in the calendar.
if ("TD" == event.srcElement.tagName)
// Test whether day is valid.
if ("" != event.srcElement.innerText)
{
var mn = document.all.month.selectedIndex+1;
var Year = document.all.year [document.all.year.selectedIndex].text;
document.all[element_id].value=event.srcElement.innerText+"/"+mn +"/"  +Year;
//document.all.calendar.style.visibility="hidden";
document.all.calendar.style.display="none";
}
}

function GetBodyOffsetX(el_name, shift)
{
var x;
var y;
x = 0;
y = 0;

var elem = document.all[el_name];
do
{
x += elem.offsetLeft;
y += elem.offsetTop;
if (elem.tagName == "BODY")
break;
elem = elem.offsetParent;
} while  (1 > 0);

shift[0] = x;
shift[1] = y;
return  x;
}

function SetCalendarOnElement(el_name)
{
if (el_name=="")
el_name = element_id;
var shift = new Array(2);
GetBodyOffsetX(el_name, shift);
document.all.calendar.style.pixelLeft  = shift[0]; //  - document.all.calendar.offsetLeft;
document.all.calendar.style.pixelTop = shift[1] + 25 ;
}



function ShowCalendar(elem_name)
{
if (elem_name=="")
elem_name = element_id;

element_id  = elem_name; // element_id is global variable
newCalendar();
SetCalendarOnElement(element_id);
//document.all.calendar.style.visibility = "visible";
document.all.calendar.style.display="inline";
}

function HideCalendar()
{
//document.all.calendar.style.visibility="hidden";
document.all.calendar.style.display="none";
}

function toggleCalendar(elem_name)
{
//if (document.all.calendar.style.visibility == "hidden")
if(document.all.calendar.style.display=="none")
ShowCalendar(elem_name);
else
HideCalendar();
}