var months = new Array("Janeiro", "Fevereiro", "Março", "Abril", "Maio", "Junho", "Julho", "Augosto", "Setembro", "Outubro", "Novembro", "Dezembro");
var daysInMonth = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
var days = new Array("Dom", "Seg", "Ter", "Qua", "Qui", "Sex", "Sab");

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() {
    //alert(navigator.appName);
    if (document.all) {
        var parseYear = parseInt(document.all.year[document.all.year.selectedIndex].text);
        
    } else {
        var parseYear = document.getElementById("year").value;
    }


    if (document.all) {
        var newCal = new Date(parseYear, document.all.month.selectedIndex, 1);        
    }
    else {
        var newCal = new Date(parseYear, document.getElementById("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.getElementById("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) {
            if (document.all) {
                document.all.todayday.innerText = "Hoje: " + day + "/" + (newCal.getMonth() + 1) + "/" + newCal.getFullYear();
            }
            else {
                document.getElementById("todayday").innerText = "Hoje: " + day + "/" + (newCal.getMonth() + 1) + "/" + newCal.getFullYear();
            }            
        }
        // Output the day number into the cell.
        if ((daily > 0) && (daily <= intDaysInMonth))
            cell.innerText = daily++;
        else
            cell.innerText = "";

        //alert(cell.innerText);
    }
    
}

function getTodayDay() {
    if (document.all) {
        document.all[element_id].value = today.day + "/" + (today.month + 1) + "/" + today.year;
        //document.all.calendar.style.visibility="hidden";
        document.getElementById("calendar").style.display = "none";
        document.all.year.selectedIndex = 100;
        document.all.month.selectedIndex = today.month;
    }
    else {
        document.getElementById(element_id).value = today.day + "/" + (today.month + 1) + "/" + today.year;
        //document.all.calendar.style.visibility="hidden";
        document.getElementById("calendar").style.display = "none";
        document.getElementById("year").selectedIndex = 100;
        document.getElementById("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) {
            if (document.all) {
                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;
                addIdade(event.srcElement.innerText + "/" + mn + "/" + Year);
            }
            else {
                var mn = document.getElementById("month").selectedIndex + 1;
                var Year = document.getElementById("year").value;
                document.getElementById(element_id).value = event.srcElement.innerText + "/" + mn + "/" + Year;
                addIdade(event.srcElement.innerText + "/" + mn + "/" + Year);
            }
        //document.all.calendar.style.visibility="hidden";
        document.getElementById("calendar").style.display = "none";
        
    }
}

function GetBodyOffsetX(el_name, shift) {
    var x;
    var y;
    x = 0;
    y = 0;
    if (document.all) {
        var elem = document.all[el_name];
    }
    else {
        var elem = document.getElementById(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);
    //alert(el_name);
    if (document.all) {
        document.all.calendar.style.pixelLeft = shift[0]; //  - document.all.calendar.offsetLeft;
        document.all.calendar.style.pixelTop = shift[1] + 25;
    }
    else {
        document.getElementById("calendar").style.pixelLeft = shift[0]; //  - document.all.calendar.offsetLeft;
        document.getElementById("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";
    if (document.all) {
        document.getElementById("calendar").style.display = "block";
    }
    
}

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

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