var datePickerDivID = "datepicker";

var iFrameDivID = "datepickeriframe";

var dayArrayShort = new Array('Н', 'П', 'В', 'С', 'Ч', 'П', 'С');

var dayArrayMed = new Array('Нд.', 'Пон.', 'Вт.', 'Ср.', 'Чет.', 'Пет.', 'Съб.');

var dayArrayLong = new Array('Неделя', 'Понеделник', 'Вторник', 'Сряда', 'Четвъртък', 'Петък', 'Събота');

var monthArrayShort =new Array('Яну', 'Фев', 'Март', 'Апр', 'Май', 'Юни', 'Юли', 'Авг', 'Сеп', 'Окт', 'Ноем', 'Дек');

var monthArrayMed = new Array('Яну', 'Фев', 'Март', 'Апр', 'Май', 'Юни', 'Юли', 'Авг', 'Сеп', 'Окт', 'Ноем', 'Дек');

var monthArrayLong = new Array('Януари', 'Февруари', 'Март', 'Април', 'Май', 'Юни', 'Юли', 'Август', 'Септември', 'Октомври', 'Ноември', 'Декември');

var defaultDateSeparator = "-";        // common values would be "/" or "."

var defaultDateFormat = "ymd"    // valid values are "mdy", "dmy", and "ymd"

var dateSeparator = defaultDateSeparator;

var dateFormat = defaultDateFormat;

function displayDatePicker(dateFieldName, displayBelowThisObject, dtFormat, dtSep)

{

  var targetDateField = document.getElementsByName (dateFieldName).item(0);

  if (!displayBelowThisObject)

    displayBelowThisObject = targetDateField;

  if (dtSep)

    dateSeparator = dtSep;

  else

    dateSeparator = defaultDateSeparator;

  if (dtFormat)

    dateFormat = dtFormat;

  else

    dateFormat = defaultDateFormat;

 

  var x = displayBelowThisObject.offsetLeft;

  var y = displayBelowThisObject.offsetTop + displayBelowThisObject.offsetHeight ;

  var parent = displayBelowThisObject;

  while (parent.offsetParent) {

    parent = parent.offsetParent;

    x += parent.offsetLeft;

    y += parent.offsetTop ;

  } 

  drawDatePicker(targetDateField, x, y);

}



function drawDatePicker(targetDateField, x, y)

{

  var dt = getFieldDate(targetDateField.value );

  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(targetDateField.name, dt.getFullYear(), dt.getMonth(), dt.getDate());

}

function refreshDatePicker(dateFieldName, year, month, day)

{

  var thisDay = new Date();

 

  if ((month >= 0) && (year > 0)) {

    thisDay = new Date(year, month, 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 class='dpTR'>";

  var TR_title = "<tr class='dpTitleTR'>";

  var TR_days = "<tr class='dpDayTR'>";

  var TR_todaybutton = "<tr class='dpTodayButtonTR'>";

  var xTR = "</tr>" + crlf;

  var TD = "<td class='dpTD' onMouseOut='this.className=\"dpTD\";' onMouseOver=' this.className=\"dpTDHover\";' ";

  var TD_title = "<td colspan=5 class='dpTitleTD'>";

  var TD_buttons = "<td class='dpButtonTD'>";

  var TD_todaybutton = "<td colspan=7 class='dpTodayButtonTD'>";

  var TD_days = "<td class='dpDayTD'>";

  var TD_selected = "<td class='dpDayHighlightTD' onMouseOut='this.className=\"dpDayHighlightTD\";' onMouseOver='this.className=\"dpTDHover\";' ";   

  var xTD = "</td>" + crlf;

  var DIV_title = "<div class='dpTitleText'>";

  var DIV_selected = "<div class='dpDayHighlight'>";

  var xDIV = "</div>";

  var html = TABLE;

  html += TR_title;

  html += TD_buttons + getButtonCode(dateFieldName, thisDay, -1, "&lt;") + xTD;

  html += TD_title + DIV_title + monthArrayLong[ thisDay.getMonth()] + " " + thisDay.getFullYear() + xDIV + xTD;

  html += TD_buttons + getButtonCode(dateFieldName, thisDay, 1, "&gt;") + xTD;

  html += xTR;

  html += TR_days;

  for(i = 0; i < dayArrayShort.length; i++)

    html += TD_days + dayArrayShort[i] + xTD;

  html += xTR;

  html += TR;

  for (i = 0; i < thisDay.getDay(); i++)

    html += TD + "&nbsp;" + xTD;

  do {

    dayNum = thisDay.getDate();

    TD_onclick = " onclick=\"updateDateField('" + dateFieldName + "', '" + getDateString(thisDay) + "');\">";

    

    if (dayNum == day)

      html += TD_selected + TD_onclick + DIV_selected + dayNum + xDIV + xTD;

    else

      html += TD + TD_onclick + dayNum + xTD;

    if (thisDay.getDay() == 6)

      html += xTR + TR;

    thisDay.setDate(thisDay.getDate() + 1);

  } while (thisDay.getDate() > 1)

  if (thisDay.getDay() > 0) {

    for (i = 6; i > thisDay.getDay(); i--)

      html += TD + "&nbsp;" + xTD;

  }

  html += xTR;

  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(\"" + dateFieldName + "\");'>днес</button> ";

  html += "<button class='dpTodayButton' onClick='updateDateField(\"" + dateFieldName + "\");'>затвори</button>";

  html += xTD + xTR;

  html += xTABLE;

 

  document.getElementById(datePickerDivID).innerHTML = html;

  adjustiFrame();

}

function getButtonCode(dateFieldName, 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;

  }

 

  return "<button class='dpButton' onClick='refreshDatePicker(\"" + dateFieldName + "\", " + 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);

 

  switch (dateFormat) {

    case "dmy" :

      return dayString + dateSeparator + monthString + dateSeparator + dateVal.getFullYear();

    case "ymd" :

      return dateVal.getFullYear() + dateSeparator + monthString + dateSeparator + dayString;

    case "mdy" :

    default :

      return monthString + dateSeparator + dayString + dateSeparator + dateVal.getFullYear();

  }

}

function getFieldDate(dateString)

{

  var dateVal;

  var dArray;

  var d, m, y;

 

  try {

    dArray = splitDateString(dateString);

    if (dArray) {

      switch (dateFormat) {

        case "dmy" :

          d = parseInt(dArray[0], 10);

          m = parseInt(dArray[1], 10) - 1;

          y = parseInt(dArray[2], 10);

          break;

        case "ymd" :

          d = parseInt(dArray[2], 10);

          m = parseInt(dArray[1], 10) - 1;

          y = parseInt(dArray[0], 10);

          break;

        case "mdy" :

        default :

          d = parseInt(dArray[1], 10);

          m = parseInt(dArray[0], 10) - 1;

          y = parseInt(dArray[2], 10);

          break;

      }

      dateVal = new Date(y, m, d);

    } else if (dateString) {

      dateVal = new Date(dateString);

    } else {

      dateVal = new Date();

    }

  } catch(e) {

    dateVal = new Date();

  }

 

  return dateVal;

}

function splitDateString(dateString)

{

  var dArray;

  if (dateString.indexOf("/") >= 0)

    dArray = dateString.split("/");

  else if (dateString.indexOf(".") >= 0)

    dArray = dateString.split(".");

  else if (dateString.indexOf("-") >= 0)

    dArray = dateString.split("-");

  else if (dateString.indexOf("\\") >= 0)

    dArray = dateString.split("\\");

  else

    dArray = false;

 

  return dArray;

}

function updateDateField(dateFieldName, dateString)

{

  var targetDateField = document.getElementsByName (dateFieldName).item(0);

  if (dateString)

    targetDateField.value = dateString;

 

  var pickerDiv = document.getElementById(datePickerDivID);

  pickerDiv.style.visibility = "hidden";

  pickerDiv.style.display = "none";

 

  adjustiFrame();

  targetDateField.focus();

  if ((dateString) && (typeof(datePickerClosed) == "function"))

    datePickerClosed(targetDateField);

}

function adjustiFrame(pickerDiv, iFrameDiv)

{

  var is_opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1);

  if (is_opera)

    return;

  try {

    if (!document.getElementById(iFrameDivID)) {

      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) {

  } 

}