var datePickerDivID = "datepicker";
var iFrameDivID = "datepickeriframe";

var dayArrayShort = new Array('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');
var monthArrayLong = new Array('JANUARY', 'FEBRUARY', 'MARCH', 'APRIL', 'MAY', 'JUNE', 'JULY', 'AUGUST', 'SEPTEMBER', 'OCTOBER', 'NOVEMBER', 'DECEMBER');
var defaultDateSeparator = "/";
var defaultDateFormat = "dmy"
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("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>";
    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 align='right' valign='middle' class='dpCrossButtonTD' 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>";
 
    var html = TABLE;
    html += TR_todaybutton + TD_todaybutton;
    html += "<label class='dpCloseButton' onClick='updateDateField(\"" + dateFieldName + "\");'>&times;</label>";
    html += xTD + xTR;

    html += TR_title;
    html += TD_buttons + getButtonCode(dateFieldName, thisDay, -1, "&lsaquo;") + xTD;
    html += TD_title + DIV_title + monthArrayLong[ thisDay.getMonth()] + " " + thisDay.getFullYear() + xDIV + xTD;
    html += TD_buttons + getButtonCode(dateFieldName, thisDay, 1, "&rsaquo;") + 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;
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 "<label class='dpButton' onClick='refreshDatePicker(\"" + dateFieldName + "\", " + newYear + ", " + newMonth + ");'>" + label + "</label>";
}

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) {
}
}