// Core javascript helper functions

// basic browser identification & version

var isOpera = (navigator.userAgent.indexOf("Opera")>=0) && parseFloat(navigator.appVersion);

var isIE = ((document.all) && (!isOpera)) && parseFloat(navigator.appVersion.split("MSIE ")[1].split(";")[0]);

// Cross-browser event handlers.

function addEvent(obj, evType, fn) {

    if (obj.addEventListener) {

        obj.addEventListener(evType, fn, false);

        return true;

    } else if (obj.attachEvent) {

        var r = obj.attachEvent("on" + evType, fn);

        return r;

    } else {

        return false;

    }

}

function removeEvent(obj, evType, fn) {

    if (obj.removeEventListener) {

        obj.removeEventListener(evType, fn, false);

        return true;

    } else if (obj.detachEvent) {

        obj.detachEvent("on" + evType, fn);

        return true;

    } else {

        return false;

    }

}

// quickElement(tagType, parentReference, textInChildNode, [, attribute, attributeValue ...]);

function quickElement() {

    var obj = document.createElement(arguments[0]);

    if (arguments[2] != '' && arguments[2] != null) {

        var textNode = document.createTextNode(arguments[2]);

        obj.appendChild(textNode);

    }

    var len = arguments.length;

    for (var i = 3; i < len; i += 2) {

        obj.setAttribute(arguments[i], arguments[i+1]);

    }

    arguments[1].appendChild(obj);

    return obj;

}

// ----------------------------------------------------------------------------

// Cross-browser xmlhttp object

// from http://jibbering.com/2002/4/httprequest.html

// ----------------------------------------------------------------------------

var xmlhttp;

/*@cc_on @*/

/*@if (@_jscript_version >= 5)

    try {

        xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");

    } catch (e) {

        try {

            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");

        } catch (E) {

            xmlhttp = false;

        }

    }

@else

    xmlhttp = false;

@end @*/

if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {

  xmlhttp = new XMLHttpRequest();

}

// ----------------------------------------------------------------------------

// Find-position functions by PPK

// See http://www.quirksmode.org/js/findpos.html

// ----------------------------------------------------------------------------

function findPosX(obj) {

    var curleft = 0;

    if (obj.offsetParent) {

        while (obj.offsetParent) {

            curleft += obj.offsetLeft - ((isOpera) ? 0 : obj.scrollLeft);

            obj = obj.offsetParent;

        }

        // IE offsetParent does not include the top-level

        if (isIE && obj.parentElement){

            curleft += obj.offsetLeft - obj.scrollLeft;

        }

    } else if (obj.x) {

        curleft += obj.x;

    }

    return curleft;

}

function findPosY(obj) {

    var curtop = 0;

    if (obj.offsetParent) {

        while (obj.offsetParent) {

            curtop += obj.offsetTop - ((isOpera) ? 0 : obj.scrollTop);

            obj = obj.offsetParent;

        }

        // IE offsetParent does not include the top-level

        if (isIE && obj.parentElement){

            curtop += obj.offsetTop - obj.scrollTop;

        }

    } else if (obj.y) {

        curtop += obj.y;

    }

    return curtop;

}

//-----------------------------------------------------------------------------

// Date object extensions

// ----------------------------------------------------------------------------

Date.prototype.getCorrectYear = function() {

    // Date.getYear() is unreliable --

    // see http://www.quirksmode.org/js/introdate.html#year

    var y = this.getYear() % 100;

    return (y < 38) ? y + 2000 : y + 1900;

}

Date.prototype.getTwelveHours = function() {

    hours = this.getHours();

    if (hours == 0) {

        return 12;

    }

    else {

        return hours <= 12 ? hours : hours-12

    }

}

Date.prototype.getTwoDigitMonth = function() {

    return (this.getMonth() < 9) ? '0' + (this.getMonth()+1) : (this.getMonth()+1);

}

Date.prototype.getTwoDigitDate = function() {

    return (this.getDate() < 10) ? '0' + this.getDate() : this.getDate();

}

Date.prototype.getTwoDigitTwelveHour = function() {

    return (this.getTwelveHours() < 10) ? '0' + this.getTwelveHours() : this.getTwelveHours();

}

Date.prototype.getTwoDigitHour = function() {

    return (this.getHours() < 10) ? '0' + this.getHours() : this.getHours();

}

Date.prototype.getTwoDigitMinute = function() {

    return (this.getMinutes() < 10) ? '0' + this.getMinutes() : this.getMinutes();

}

Date.prototype.getTwoDigitSecond = function() {

    return (this.getSeconds() < 10) ? '0' + this.getSeconds() : this.getSeconds();

}

Date.prototype.getISODate = function() {

    return this.getCorrectYear() + '-' + this.getTwoDigitMonth() + '-' + this.getTwoDigitDate();

}

Date.prototype.getHourMinute = function() {

    return this.getTwoDigitHour() + ':' + this.getTwoDigitMinute();

}

Date.prototype.getHourMinuteSecond = function() {

    return this.getTwoDigitHour() + ':' + this.getTwoDigitMinute() + ':' + this.getTwoDigitSecond();

}

Date.prototype.strftime = function(format) {

    var fields = {

        c: this.toString(),

        d: this.getTwoDigitDate(),

        H: this.getTwoDigitHour(),

        I: this.getTwoDigitTwelveHour(),

        m: this.getTwoDigitMonth(),

        M: this.getTwoDigitMinute(),

        p: (this.getHours() >= 12) ? 'PM' : 'AM',

        S: this.getTwoDigitSecond(),

        w: '0' + this.getDay(),

        x: this.toLocaleDateString(),

        X: this.toLocaleTimeString(),

        y: ('' + this.getFullYear()).substr(2, 4),

        Y: '' + this.getFullYear(),

        '%' : '%'

    };

    var result = '', i = 0;

    while (i < format.length) {

        if (format.charAt(i) === '%') {

            result = result + fields[format.charAt(i + 1)];

            ++i;

        }

        else {

            result = result + format.charAt(i);

        }

        ++i;

    }

    return result;

}

// ----------------------------------------------------------------------------

// String object extensions

// ----------------------------------------------------------------------------

String.prototype.pad_left = function(pad_length, pad_string) {

    var new_string = this;

    for (var i = 0; new_string.length < pad_length; i++) {

        new_string = pad_string + new_string;

    }

    return new_string;

}

// ----------------------------------------------------------------------------

// Get the computed style for and element

// ----------------------------------------------------------------------------

function getStyle(oElm, strCssRule){

    var strValue = "";

    if(document.defaultView && document.defaultView.getComputedStyle){

        strValue = document.defaultView.getComputedStyle(oElm, "").getPropertyValue(strCssRule);

    }

    else if(oElm.currentStyle){

        strCssRule = strCssRule.replace(/\-(\w)/g, function (strMatch, p1){

            return p1.toUpperCase();

        });

        strValue = oElm.currentStyle[strCssRule];

    }

    return strValue;

}