var datePickerDivID="datepicker";

var iFrameDivID="datepickeriframe";

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

var defaultDateFormat="mdy"    // 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;");

	newNode.style.width="150px";

	newNode.style.height="80px";

    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' style='width:150px !important;'>" + 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\";' ";    // leave this tag open, because we'll be adding an onClick event

  var TD_title="<td colspan=3 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\";' ";    // 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>";

  var html=TABLE;

  html +=TR_title;

  html +=TD_buttons + getButtonCode(dateFieldName, thisDay, -12, "<<") + xTD +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 +TD_buttons+getButtonCode(dateFieldName, thisDay, 12, ">>") + 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='updateDateField(\"" + dateFieldName + "\");'>Cerrar</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) {

  }

 }