//INITIALIZATION
///////////////////////////
var html = document.getElementsByTagName('html')[0];
jscss('add', html, 'hasScript');
if (detectFlash(6)) jscss('add', html, 'hasFlash');

var hasReqdDOM = (document.getElementsByTagName && document.getElementById);

function PageInit() {
    if (!(hasReqdDOM)) return;
    Rollovers(Array('ro_arkansas', 'ro_sitemap', 'ro_home', 'ro_birding', 'ro_ethics', 'ro_wildlife'));
    InitNavMenu();
}
addEvent(window, 'load', PageInit);

function initFlash() {
    if (!document.getElementById || typeof (FlashObject) == 'undefined') return;
    myFlash = new FlashObject("/images/mp/sc_flash_final.swf", "flashy", "766", "209", 6.0, "#ffffff");
    myFlash.addParam("wmode", "opaque"); //fix bug with IE 5.x
    myFlash.write("fl_replace");
}


function PopUpSafe(els) {
    if (!els) return;
    for (var i = 0; i < els.length; i++) {
        if (els[i].rel.indexOf("external") >= 0) {
            els[i].onclick = function() { return PopWin(this.href, 'new'); }
        }
        else if (els[i].rel.indexOf(':') >= 0) {
            els[i].onclick = function() { args = this.rel.split(':'); return PopWin(this.href, args[0], args[1], args[2]); }
        }
    }
}

// DROPDOWN HANDLER
////////////////////////
function InitNavMenu() {
    var mn = document.getElementById('mainnav');
    var oldIE = (document.all && getIEVersion() < 7)
    if (!mn) return;

    var uls = mn.getElementsByTagName('ul');

    var fn_a = function() { setLyr(this); }
    var fn_d = function() { unsetLyr(this); }
    if (oldIE) {
        fn_a = IEactive;
        fn_d = IEinactive;
    }
    for (var i = 0; i < uls.length; i++) {
        //setOpacity(uls[i],0);
        if (uls[i].id == '' || !uls[i].id) uls[i].id = 'menu' + i;
        uls[i].parentNode.navMenu = uls[i];
        if(oldIE)
        {
            uls[i]["onactivate"] = setLyr_this;
            uls[i]["ondeactivate"] = unsetLyr_this;
        }
        uls[i].activator = getActivator(uls[i]);
        uls[i].parentNode.onmouseover = fn_a;
        uls[i].parentNode.onmouseout = fn_d;
        if (oldIE) {
            if (uls[i].parentNode.nodeName != 'DD') {
                uls[i].onmouseover = function() { if (this.activator) jscss('add', this.activator, "chsel"); };
                uls[i].onmouseout = function() { if (this.activator) jscss('remove', this.activator, "chsel"); };
            }
        }
    }
}
//action to occur when the menu is activated
function setLyr_this() {
    setLyr(this);
}
function setLyr(activator) {
    if (!activator.active) Fade(activator.id, 60, 100, 200, (new Date).getTime());
    activator.active = true;
    if (CloseTimers[activator.id]) clearTimeout(CloseTimers[activator.id]);
    if (activator.parentNode.nodeName != "DD") {
        var cw = document.body.clientWidth || window.innerWidth;
        var diff = (findObjPos(activator).dx + activator.offsetWidth) - cw;
        if (diff > 0 && findObjPos(activator).dx < cw)
            activator.style.left = diff + "px";
    }
}
//action to occur when menu is deactivated
function unsetLyr_this() {
    unsetLyr(this)
}
function unsetLyr(activator) {
    jscss('add', activator, 'closeing');
    CloseTimers[activator.id] = window.setTimeout("close('" + activator.id + "')", 200);
    activator.style.left = null;
}
// set delay before closing menu
var CloseTimers = new Object();
function close(id) {
    if (!hasReqdDOM) return;
    el = document.getElementById(id);
    if (!el) return;
    el.active = null;
    jscss('remove', el, 'closeing');
    CloseTimers[id] = null;
    //setOpacity(el,0);
}
// Find the object that "activates" the menu
function getActivator(n) {
    while (n.previousSibling) {
        n = n.previousSibling;
        if (n.nodeName == "A") { return n; }
    }
    return null;
}

// additional properties for IE compatibility
function IEactive() { jscss('add', this, "IEhover"); jscss('add', this.navMenu, "ddesc"); this.navMenu.onactivate(); }
function IEinactive() { jscss('remove', this, "IEhover"); jscss('remove', this.navMenu, "ddesc"); this.navMenu.ondeactivate(); }


//IMAGE ROLLOVERS
///////////////////////////
var over = new Object();
var out = new Object();
function Rollovers(idArr, func) {
    var imgs, a;
    if (!func) func = getRollSrc;
    if (!document.images) return;

    for (i = 0; i < idArr.length; i++) {
        imgs = getObj(idArr[i]);
        if (!imgs) continue;
        out[idArr[i]] = new Image();
        over[idArr[i]] = new Image();
        out[idArr[i]].src = imgs.src;
        over[idArr[i]].src = func(imgs.src, 1);
        a = imgs.parentNode;
        if ((a && a.tagName.toLowerCase() == 'a')) {
            a.onmouseover = function() { this.childNodes[0].src = over[this.childNodes[0].id].src; }
            a.onmouseout = function() { this.childNodes[0].src = out[this.childNodes[0].id].src; }
            a.onfocus = function() { this.childNodes[0].src = over[this.childNodes[0].id].src; }
            a.onblur = function() { this.childNodes[0].src = out[this.childNodes[0].id].src; }
        }
        else if (imgs.tagName.toLowerCase() == 'input') {
            imgs.onmouseover = function() { this.src = over[this.id].src; }
            imgs.onmouseout = function() { this.src = out[this.id].src; }
        }
    }
}
function getRollSrc(src, hover) { return (hover) ? src.replace(/a.(gif|jpg)/, "b.$1") : src.replace(/b.(gif|jpg)/, "a.$1"); }

//UTILITY FUNCTIONS
///////////////////////////
var wini; //Reference to a window
function PopWin(url, name, width, height) {
    var s;
    if (width || height) {
        h = (height) ? height : 600;
        w = (width) ? width : 800;
        lp = (screen.width) ? (screen.width - w) / 2 : 0;
        tp = (screen.height) ? (screen.height - h) / 2 : 0;
        sc = (name == 'gallery') ? 'no' : 'yes';
        s = 'height=' + h + ',width=' + w + ',top=' + tp + ',left=' + lp + ',scrollbars=' + sc + ',resizable';
    }
    else s = '';
    wini = window.open(url, name, s);
    if (wini) wini.focus();
    return (!wini)
} // PopWin()

function getObj(objId) {
    var obj;
    if (document.getElementById)
        obj = document.getElementById(objId);
    else if (document.all)
        obj = document.all[objId];
    else
        obj = null;
    return obj;
}

function addEvent(obj, evType, fn) {
    if (obj.addEventListener) {
        obj.addEventListener(evType, fn, false);
    }
    else if (obj.attachEvent) {
        var r = obj.attachEvent("on" + evType, fn);
    }
    else {
        if (typeof (obj['on' + evType]) == 'function') {
            var last = obj['on' + evType];
            obj['on' + evType] = null;
            obj['on' + evType] = function() { last(); fn(); };
        }
        else obj['on' + evType] = fn;
    }
}

function setOpacity(obj, opacity) {
    opacity = (opacity == 100) ? 99.999 : opacity;
    // IE/Win -jps disabled
    //obj.style.filter = "alpha(opacity:"+opacity+")";
    // Safari<1.2, Konqueror
    obj.style.KHTMLOpacity = opacity / 100;
    // Older Mozilla and Firefox
    obj.style.MozOpacity = opacity / 100;
    // Safari 1.2, newer Firefox and Mozilla, CSS3
    obj.style.opacity = opacity / 100;
}

var Faders = new Object();
function Fade(objId, from, to, dur, st) {
    obj = document.getElementById(objId);
    var time = (new Date).getTime();
    var Tpos = (time - st) / dur;
    if (time >= dur + st) {
        setOpacity(obj, to);
        clearInterval(Faders[objId]);
        Faders[objId] = null;
    }
    else {
        next = ((-Math.cos(Tpos * Math.PI) / 2) + 0.5) * (to - from) + from;
        setOpacity(obj, next);
        if (!Faders[objId]) Faders[objId] = setInterval("Fade('" + objId + "'," + from + "," + to + "," + dur + "," + st + ")", 13);
    }
}

function findObjPos(obj) {
    var curtop = 0;
    var curleft = 0;
    if (obj.offsetParent) {
        while (obj.offsetParent) {
            curleft += obj.offsetLeft
            curtop += obj.offsetTop
            obj = obj.offsetParent;
        }
    }
    else if (obj.y && obj.x) {
        curtop += obj.y;
        curleft += obj.x;
    }
    var t = new Object();
    t.dx = curleft;
    t.dy = curtop;
    return t;
}

// found at http://www.onlinetools.org/articles/unobtrusivejavascript/cssjsseparation.html
function jscss(a, o, c1, c2) {
    switch (a) {
        case 'swap':
            o.className = !jscss('check', o, c1) ? o.className.replace(c2, c1) : o.className.replace(c1, c2);
            break;
        case 'add':
            if (!jscss('check', o, c1)) { o.className += o.className ? ' ' + c1 : c1; }
            break;
        case 'remove':
            var rep = o.className.match(' ' + c1) ? ' ' + c1 : c1;
            o.className = o.className.replace(rep, '');
            break;
        case 'check':
            return new RegExp('\\b' + c1 + '\\b').test(o.className)
            break;
    }
}

// FUNCTIONS NEEDED FOR VARIOUS DETECTIONS
///////////////////////////////////////////
function getIEVersion() {
    var rv = -1;
    if (navigator.appName == 'Microsoft Internet Explorer') {
        var ua = navigator.userAgent;
        var re = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
        if (re.exec(ua) != null)
            rv = parseFloat(RegExp.$1);
    }
    return rv;
}

function getFlashVersion() {
    var flashversion = 0;
    if (navigator.plugins && navigator.mimeTypes.length) {
        var x = navigator.plugins["Shockwave Flash"];
        if (x && x.description) {
            var y = x.description;
            flashversion = y.charAt(y.indexOf('.') - 1);
        }
    } else {
        result = false;
        for (var i = 15; i >= 3 && result != true; i--) {
            execScript('on error resume next: result = IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash.' + i + '"))', 'VBScript');
            flashversion = i;
        }
    }
    return flashversion;
}
function detectFlash(ver) { return (getFlashVersion() >= ver) ? true : false; }