//
// CONFIGURATION
// png_overlay is the png 'frame' that will be loaded over the images with a class name of "frame"
// suffix is the identifier for the rollover image; image.jpg -> image_suffix.jpg
//
//	var png_overlay = 'rounded_frame.png';
//	var suffix = '_over';

//
//	addEvent()
//	Allows attachment of events to elements
//
function addEvent(obj, type, fn) {
    if (obj.addEventListener) {
        obj.addEventListener(type, fn, false);
        EventCache.add(obj, type, fn);
    }
    else if (obj.attachEvent) {
        obj["e" + type + fn] = fn;
        obj[type + fn] = function() { obj["e" + type + fn](window.event); }
        obj.attachEvent("on" + type, obj[type + fn]);
        EventCache.add(obj, type, fn);
    }
    else {
        obj["on" + type] = obj["e" + type + fn];
    }
}
var EventCache = function() {
    var listEvents = [];
    return {
        listEvents: listEvents,
        add: function(node, sEventName, fHandler) {
            listEvents.push(arguments);
        },
        flush: function() {
            var i, item;
            for (i = listEvents.length - 1; i >= 0; i = i - 1) {
                item = listEvents[i];
                if (item[0].removeEventListener) {
                    item[0].removeEventListener(item[1], item[2], item[3]);
                };
                if (item[1].substring(0, 2) != "on") {
                    item[1] = "on" + item[1];
                };
                if (item[0].detachEvent) {
                    item[0].detachEvent(item[1], item[2]);
                };
                item[0][item[1]] = null;
            };
        }
    };
} ();

addEvent(window, 'unload', EventCache.flush);

//
//	correctPNG()
//	Allows transparent PNG images to be display correctly in IE
//	Not sure who wrote it, but thanks
//
function correctPNG() {
    for (var i = 0; i < document.images.length; i++) {
        var img = document.images[i]
        var imgName = img.src.toUpperCase()
        if (imgName.substring(imgName.length - 3, imgName.length) == "PNG") {
            var imgID = (img.id) ? "id='" + img.id + "' " : ""
            var imgClass = (img.className) ? "class='" + img.className + "' " : ""
            var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
            var imgStyle = "display:inline-block;" + img.style.cssText
            if (img.align == "left") imgStyle = "float:left;" + imgStyle
            if (img.align == "right") imgStyle = "float:right;" + imgStyle
            if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
            var strNewHTML = "<span " + imgID + imgClass + imgTitle
			+ " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
			+ "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
			+ "(src=\'" + img.src + "\', sizingMethod='image');\"></span>"
            img.outerHTML = strNewHTML
            i = i - 1
        }
    }
}

//
//	rollovers()
//	Displays a rollover for any image with a class name of "rollover". Includes IE friendly function for transparent PNG fix.
//
var rollovers = {
    obj: Object,
    init: function() {
        for (var i = 0, over; over = document.getElementsByTagName('img')[i]; i++) {
            if (over.className.indexOf('rollover') >= 0) {
                rollovers.preload(over);
                addEvent(over, 'mouseover', rollovers.show);
                addEvent(over, 'mouseout', rollovers.hide);
            }
        }
    },
    preload: function(e) {
        var img = new Image;
        var ext = e.src.substring(e.src.length - 4, e.src.length);
        var name = e.src.substring(0, e.src.length - 4);
        img.src = name + suffix + ext;
    },
    show: function(e) {
        var ext = this.src.substring(this.src.length - 4, this.src.length);
        var name = this.src.substring(0, this.src.length - 4);
        this.src = name + suffix + ext;
    },
    hide: function(e) {
        this.src = this.src.replace(suffix, '');
    }
}
var rollovers_ie = {
    obj: Object,
    init: function() {
        if (document.getElementsByTagName('span').length < 1)
            setTimeout('rollovers_ie.init()', 500);
        for (var i = 0, span; span = document.getElementsByTagName('span')[i]; i++) {
            if (span.className.indexOf('rollover') >= 0) {
                rollovers_ie.preload(span);
                addEvent(span, 'mouseover', rollovers_ie.show);
                addEvent(span, 'mouseout', rollovers_ie.hide);
            }
        }
    },
    preload: function(e) {
        var img = new Image;
        var filter = e.style.filter;
        var src = filter.substring(filter.indexOf("src='") + 5, filter.indexOf("',"));
        var ext = src.substring(src.length - 4, src.length);
        var name = src.substring(0, src.length - 4);
        img.src = name + suffix + ext;
    },
    show: function(e) {
        var filter = this.style.filter;
        var src = filter.substring(filter.indexOf("src='") + 5, filter.indexOf("',"));
        var ext = src.substring(src.length - 4, src.length);
        var name = src.substring(0, src.length - 4);
        this.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader" + "(src=\'" + name + suffix + ext + "\', sizingMethod='image')";
    },
    hide: function(e) {
        var filter = this.style.filter;
        var src = filter.substring(filter.indexOf("src='") + 5, filter.indexOf("',"));
        this.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader" + "(src=\'" + src.replace(suffix, '') + "\', sizingMethod='image')";
    }
}

//
//	pngFrame()
//	Replaces images with class name of "frame" with png_overlay file.
//
function pngFrame() {
    var imgs = document.images;
    for (var i = 0, img; img = imgs[i]; i++) {
        if (img.className.indexOf('frame') >= 0) {
            var bgSrc = img.src;
            img.style.background = "url(" + bgSrc + ")";
            img.src = png_overlay;
        }
    }
}

//
// Load the Functions
//
if (navigator.userAgent.indexOf('MSIE') >= 0)
    addEvent(window, 'load', correctPNG);
addEvent(window, 'load', pngFrame);
if (navigator.userAgent.indexOf('MSIE') >= 0)
    addEvent(window, 'load', rollovers_ie.init);
addEvent(window, 'load', rollovers.init);