/**
from http://www.nsftools.com/tips/NotesTips.htm#datepicker
*/

var datePickerDivID = "datepicker";
var iFrameDivID = "datepickeriframe";
var dayArrayShort = new Array('Lu', 'Ma', 'Me', 'Je', 'Ve', 'Sa', 'Di');
var dayArrayMed = new Array('Lun', 'Mar', 'Mer', 'Jeu', 'Ven', 'Sam', 'Dim');
var dayArrayLong = new Array('Lundi', 'Mardi', 'Mercredi', 'Jeudi', 'Vendredi', 'Samedi', 'Dimanche');
var monthArrayShort = new Array('Jan', 'Fev', 'Mar', 'Avr', 'Mai', 'Jun', 'Jul', 'Aou', 'Sep', 'Oct', 'Nov', 'Dec');
var monthArrayMed = new Array('Jan', 'Fev', 'Mars', 'Avr', 'Mai', 'Juin', 'Juil', 'Aout', 'Sept', 'Oct', 'Nov', 'Dec');
var monthArrayLong = new Array('Janvier', 'Février', 'Mars', 'Avril', 'Mai', 'Juin', 'Juillet', 'Aout', 'Septembre', 'Octobre', 'Novembre', 'Décembre');
 
function displayDatePicker(dayFieldName,
                           monthFieldName,
                           yearFieldName) {
  var targetDayField = document.getElementsByName (dayFieldName).item(0);
  var targetMonthField = document.getElementsByName (monthFieldName).item(0);
  var targetYearField = document.getElementsByName (yearFieldName).item(0);
  var x = targetDayField.offsetLeft;
  var y = targetDayField.offsetTop + targetDayField.offsetHeight ;
  var parent = targetDayField;
  while (parent.offsetParent) {
    parent = parent.offsetParent;
    x += parent.offsetLeft;
    y += parent.offsetTop ;
  }
  drawDatePicker(targetDayField, targetMonthField, targetYearField, x, y);
}

function drawDatePicker(targetDayField,
                        targetMonthField,
                        targetYearField,
                        x, y) {
  if (!document.getElementById(datePickerDivID)) {
    var newNode = document.createElement("div");
    newNode.setAttribute("id", datePickerDivID);
    newNode.setAttribute("class", "dpDiv");
    newNode.setAttribute("style", "visibility: hidden;");
    document.body.appendChild(newNode);
  }
  var pickerDiv = document.getElementById(datePickerDivID);
  pickerDiv.style.position = "absolute";
  pickerDiv.style.left = x + "px";
  pickerDiv.style.top = y + "px";
  pickerDiv.style.visibility = (pickerDiv.style.visibility == "visible" ? "hidden" : "visible");
  pickerDiv.style.display = (pickerDiv.style.display == "block" ? "none" : "block");
  pickerDiv.style.zIndex = 10000;
  refreshDatePicker(targetYearField.name,
                    targetMonthField.name,
                    targetDayField.name,
                    targetYearField.value,
                    targetMonthField.value,
                    targetDayField.value);
}

function refreshDatePicker(yearFieldName, monthFieldName, dayFieldName,
                           year, month, day) {
  var thisDay = new Date();
  if ((month >= 0) && (year > 0)) {
    thisDay = new Date(year, month-1, 1);
  } else {
    day = thisDay.getDate();
    thisDay.setDate(1);
  }
  var crlf = "\r\n";
  var TABLE = "<table cols=7 class='dpTable'>" + crlf;
  var xTABLE = "</table>" + crlf;
  var TR = "<tr>";
  var TR_title = "<tr>";
  var TR_days = "<tr>";
  var TR_todaybutton = "<tr>";
  var xTR = "</tr>" + crlf;
  var TD = "<td class='dpTD' onMouseOut='this.className=\"dpTD\";' onMouseOver=' this.className=\"dpTDHover\";' ";    // leave this tag open, because we'll be adding an onClick event
  var TD_title = "<td colspan=5>";
  var TD_buttons = "<td>";
  var TD_todaybutton = "<td colspan=7>";
  var TD_days = "<td class='dpDayTD'>";
  var TD_selected = "<td class='dpDayHighlightTD' onMouseOut='this.className=\"dpDayHighlightTD\";' onMouseOver='this.className=\"dpTDHover\";' ";    // leave this tag open, because we'll be adding an onClick event
  var xTD = "</td>" + crlf;
  var DIV_title = "<div class='dpTitleText'>";
  var DIV_selected = "<div class='dpDayHighlight'>";
  var xDIV = "</div>";
 
  // start generating the code for the calendar table
  var html = TABLE;
 
  // this is the title bar, which displays the month and the buttons to
  // go back to a previous month or forward to the next month
  html += TR_title;
  html += TD_buttons + getButtonCode(yearFieldName, monthFieldName, dayFieldName,
                                     thisDay, -1, "&lt;") + xTD;
  html += TD_title + DIV_title + monthArrayLong[ thisDay.getMonth()] + " " + thisDay.getFullYear() + xDIV + xTD;
  html += TD_buttons + getButtonCode(yearFieldName, monthFieldName, dayFieldName,
                                     thisDay, 1, "&gt;") + xTD;
  html += xTR;
 
  // this is the row that indicates which day of the week we're on
  html += TR_days;
  for(i = 0; i < dayArrayShort.length; i++)
    html += TD_days + dayArrayShort[i] + xTD;
  html += xTR;
 
  // now we'll start populating the table with days of the month
  html += TR;
 
  // first, the leading blanks
  for (i = 0; i < thisDay.getDay() -1; i++)
    html += TD + "&nbsp;" + xTD;
 
  // now, the days of the month
  do {
    dayNum = thisDay.getDate();
    TD_onclick = " onclick=\"updateDateField('" + yearFieldName + "','"+ monthFieldName + "','" + dayFieldName + "', " + getDateString(thisDay) + ");\">";
    
    if (dayNum == day)
      html += TD_selected + TD_onclick + DIV_selected + dayNum + xDIV + xTD;
    else
      html += TD + TD_onclick + dayNum + xTD;
    
    // if this is a Saturday, start a new row
    if (thisDay.getDay() == 0)
      html += xTR + TR;
    
    // increment the day
    thisDay.setDate(thisDay.getDate() + 1);
  } while (thisDay.getDate() > 1)
 
  // fill in any trailing blanks
  if (thisDay.getDay() > 0) {
    for (i = 6; i > thisDay.getDay(); i--)
      html += TD + "&nbsp;" + xTD;
  }
  html += xTR;
 
  // add a button to allow the user to easily return to today, or close the calendar
  var today = new Date();
  var todayString = "Today is " + dayArrayMed[today.getDay()] + ", " + monthArrayMed[ today.getMonth()] + " " + today.getDate();
  html += TR_todaybutton + TD_todaybutton;
  html += "<button class=\"dpTodayButton\" onClick=\"refreshDatePicker('" + yearFieldName + "','"+ monthFieldName + "','" + dayFieldName +"',"+  getDateString(today)+");\">Mois courant</button> ";
  html += "<button class=\"dpTodayButton\" onClick=\"updateDateField(\'" + yearFieldName + "', '"+ monthFieldName + "', '" + dayFieldName + "',0,0,0);\">Annuler</button>";
  html += xTD + xTR;
 
  // and finally, close the table
  html += xTABLE;
 
  document.getElementById(datePickerDivID).innerHTML = html;
  // add an "iFrame shim" to allow the datepicker to display above selection lists
  adjustiFrame();
}

function getButtonCode(yearFieldName, monthFieldName, dayFieldName,
                       dateVal, adjust, label) {
  var newMonth = (dateVal.getMonth () + adjust) % 12;
  var newYear = dateVal.getFullYear() + parseInt((dateVal.getMonth() + adjust) / 12);
  if (newMonth < 0) {
    newMonth += 12;
    newYear += -1;
  }
  newMonth +=1;
  return "<button class=\"dpButton\" onClick=\"refreshDatePicker('" + yearFieldName + "', '"+ monthFieldName + "', '" + dayFieldName + "', " + newYear + ", " + newMonth + ");\">" + label + "</button>";
}

function getDateString(dateVal) {
  var dayString = "00" + dateVal.getDate();
  var monthString = "00" + (dateVal.getMonth()+1);
  dayString = dayString.substring(dayString.length - 2);
  monthString = monthString.substring(monthString.length - 2);
  dateArg="'"+dateVal.getFullYear()+"','"+monthString+"','"+dayString+"'";
  return dateArg;
}

function updateDateField(yearFieldName, monthFieldName, dayFieldName,
                         year,month, day) {
  var targetDayField = document.getElementsByName (dayFieldName).item(0);
  var targetMonthField = document.getElementsByName (monthFieldName).item(0);
  var targetYearField = document.getElementsByName (yearFieldName).item(0);
  if (year && year>0) {
    targetYearField.value = year;
    targetMonthField.value = month;
    targetDayField.value = day;
  }
  var pickerDiv = document.getElementById(datePickerDivID);
  pickerDiv.style.visibility = "hidden";
  pickerDiv.style.display = "none";
 
  adjustiFrame();
  targetYearField.focus();
}

function adjustiFrame(pickerDiv, iFrameDiv) {
  // we know that Opera doesn't like something about this, so if we
  // think we're using Opera, don't even try
  var is_opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1);
  if (is_opera)
    return;
  
  // put a try/catch block around the whole thing, just in case
  try {
    if (!document.getElementById(iFrameDivID)) {
      // don't use innerHTML to update the body, because it can cause global variables
      // that are currently pointing to objects on the page to have bad references
      //document.body.innerHTML += "<iframe id='" + iFrameDivID + "' src='javascript:false;' scrolling='no' frameborder='0'>";
      var newNode = document.createElement("iFrame");
      newNode.setAttribute("id", iFrameDivID);
      newNode.setAttribute("src", "javascript:false;");
      newNode.setAttribute("scrolling", "no");
      newNode.setAttribute ("frameborder", "0");
      document.body.appendChild(newNode);
    }
    
    if (!pickerDiv)
      pickerDiv = document.getElementById(datePickerDivID);
    if (!iFrameDiv)
      iFrameDiv = document.getElementById(iFrameDivID);
    
    try {
      iFrameDiv.style.position = "absolute";
      iFrameDiv.style.width = pickerDiv.offsetWidth;
      iFrameDiv.style.height = pickerDiv.offsetHeight ;
      iFrameDiv.style.top = pickerDiv.style.top;
      iFrameDiv.style.left = pickerDiv.style.left;
      iFrameDiv.style.zIndex = pickerDiv.style.zIndex - 1;
      iFrameDiv.style.visibility = pickerDiv.style.visibility ;
      iFrameDiv.style.display = pickerDiv.style.display;
    } catch(e) {
    }
  } catch (ee) {
  }
 
}