// GreyMatter base functions

// whitespace characters
var whitespace = " \t\n\r";


//avoid js rounding bug
function roundNumber(number, d_places) {
    var rnum = number;
    var rlength = d_places;
    if (rnum > 8191 && rnum < 10485) {
        rnum = rnum - 5000;
        var result = Math.round(rnum * Math.pow(10, rlength)) / Math.pow(10, rlength);
        result = result + 5000;
    } else {
        var result = Math.round(rnum * Math.pow(10, rlength)) / Math.pow(10, rlength);
    }
    return result;
}


//get variable from query string
function getQueryVariable(variable) {
    var query = window.location.search.substring(1);
    var vars = query.split("&");
    for (var i = 0; i < vars.length; i++) {
        var pair = vars[i].split("=");
        if (pair[0] == variable) {
            return pair[1];
        }
    }
    return "";
}


//get session cookie by name
function getCookie(c_name) {
    if (document.cookie.length > 0) {
        c_start = document.cookie.indexOf(c_name + '=')
        if (c_start != -1) {
            c_start = c_start + c_name.length + 1
            c_end = document.cookie.indexOf(';', c_start)
            if (c_end == -1) c_end = document.cookie.length
            return unescape(document.cookie.substring(c_start, c_end))
        }
    }
    return null
}


//cross-browser attach event listener    
function addEvent(elm, evType, fn, useCapture) {
    // gecko browsers & compliant with dom2
    if (elm.addEventListener) {
        elm.addEventListener(evType, fn, useCapture);
        return true; t
    }
    // ie 5+
    else if (elm.attachEvent) {
        var r = elm.attachEvent('on' + evType, fn);
        return r;
    }
    // for compatibility; untested
    else {
        elm['on' + evType] = fn;
    }
}

//get cookie expiry date (absolute)    
function getexpirydate(nodays) {
    var UTCstring;
    Today = new Date();
    nomilli = Date.parse(Today);
    Today.setTime(nomilli + nodays * 24 * 60 * 60 * 1000);
    UTCstring = Today.toUTCString();
    return UTCstring;
}

//dim background screen, except for div with a higher z index than what is specified     
function grayOut(vis, options) {
    // Pass true to gray out screen, false to ungray
    // options are optional.  This is a JSON object with the following (optional) properties
    // opacity:0-100         // Lower number = less grayout higher = more of a blackout 
    // zindex: #             // HTML elements with a higher zindex appear on top of the gray out
    // bgcolor: (#xxxxxx)    // Standard RGB Hex color code
    // grayOut(true, {'zindex':'50', 'bgcolor':'#0000FF', 'opacity':'70'});
    // Because options is JSON opacity/zindex/bgcolor are all optional and can appear
    // in any order.  Pass only the properties you need to set.
    var options = options || {};
    var zindex = options.zindex || 50;
    var opacity = options.opacity || 40;
    var opaque = (opacity / 100);
    var bgcolor = options.bgcolor || '#000000';
    var dark = document.getElementById('darkenScreenObject');
    if (!dark) {
        // The dark layer doesn't exist, it's never been created.  So we'll
        // create it here and apply some basic styles.
        // If you are getting errors in IE see: http://support.microsoft.com/default.aspx/kb/927917
        var tbody = document.getElementsByTagName("body")[0];
        var tnode = document.createElement('div');           // Create the layer.
        tnode.style.position = 'absolute';                 // Position absolutely
        tnode.style.top = '0px';                           // In the top
        tnode.style.left = '0px';                          // Left corner of the page
        tnode.style.overflow = 'hidden';                   // Try to avoid making scroll bars            
        tnode.style.display = 'none';                      // Start out Hidden
        tnode.id = 'darkenScreenObject';                   // Name it so we can find it later
        tbody.appendChild(tnode);                            // Add it to the web page
        dark = document.getElementById('darkenScreenObject');  // Get the object.
    }
    if (vis) {
        // Calculate the page width and height 
        if (document.body && (document.body.scrollWidth || document.body.scrollHeight)) {
            var pageWidth = document.body.scrollWidth + 'px';
            var pageHeight = document.body.scrollHeight + 'px';
        } else if (document.body.offsetWidth) {
            var pageWidth = document.body.offsetWidth + 'px';
            var pageHeight = document.body.offsetHeight + 'px';
        } else {
            var pageWidth = '100%';
            var pageHeight = '100%';
        }
        //set the shader to cover the entire page and make it visible.
        dark.style.opacity = opaque;
        dark.style.MozOpacity = opaque;
        dark.style.filter = 'alpha(opacity=' + opacity + ')';
        dark.style.zIndex = zindex;
        dark.style.backgroundColor = bgcolor;
        dark.style.width = pageWidth;
        dark.style.height = pageHeight;
        dark.style.display = 'block';
    } else {
        dark.style.display = 'none';
    }
}


//cross browser dynamically set style
function setStyle(object, styleText) {
    if (object.style.setAttribute) {
        object.style.setAttribute("cssText", styleText);
    }
    else {
        object.setAttribute("style", styleText);
    }
}








//validate e-mail address
function isEmail(s) {
    if (isEmpty(s))
        if (isEmail.arguments.length == 1) return false;
    else return (isEmail.arguments[1] == true);

    // is s whitespace?
    if (isWhitespace(s)) return false;

    // there must be >= 1 character before @, so we
    // start looking at character position 1 
    // (i.e. second character)
    var i = 1;
    var sLength = s.length;

    // look for @
    while ((i < sLength) && (s.charAt(i) != "@")) {
        i++
    }

    if ((i >= sLength) || (s.charAt(i) != "@")) return false;
    else i += 2;

    // look for .
    while ((i < sLength) && (s.charAt(i) != ".")) {
        i++
    }

    // there must be at least one character after the .
    if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
    else return true;
}

//check for empty string
function isEmpty(s) {
    return ((s == null) || (s.length == 0))
}


//check for whitespace
function isWhitespace(s) {
    var i;

    // Is s empty?
    if (isEmpty(s)) return true;

    // Search through string's characters one by one
    // until we find a non-whitespace character.
    // When we do, return false; if we don't, return true.

    for (i = 0; i < s.length; i++) {
        // Check that current character isn't whitespace.
        var c = s.charAt(i);

        if (whitespace.indexOf(c) == -1) return false;
    }

    // All characters are whitespace.
    return true;
}

function CheckSession(s) {
    if (s == '*!invalid!*') {
        window.location = '/_logout.ashx';
    }
}