//---------------------------------------------------------------
// Opacity Displayer, Version 1.0
// Copyright Michael Lovitt, 6/2002.
// Distribute freely, but please leave this notice intact.
//---------------------------------------------------------------

//---------------------------------------------------------------
// OPACITY OBJECT
//
// Instantiates the object, defines the properties and methods.
function oo(divId, strPath) {
    this.id = divId;
    this.path = strPath;
    if (ns) {
        if (browserVersion >= 5) {
            this.layerObject = document.getElementById(divId).style;
        } else {
            this.layerObject = eval("document." + divId);
        }
    } else {
        this.layerObject = eval(divId + ".style");
    }
    this.setBackground = od_object_setBackground;
    this.removeBackground = od_object_removeBackground;
}
// Uses AlphaImageLoader filter, or the css background property,
// as appropriate, to apply a PNG or GIF as the background of the layerObject.
function od_object_setBackground() {


    if (pngAlpha) {
        this.layerObject.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + this.path + ".png', sizingMethod='scale')";
    } else if (pngNormal) {
        this.layerObject.backgroundImage = 'url(' + this.path + '.png)';
    } else {
        this.layerObject.backgroundImage = 'url(' + this.path + '.gif)';
    }
}

// Uses AlphaImageLoader filter, or the css background property,
// as appropriate, to apply a PNG or GIF as the background of the layerObject.
function od_object_removeBackground() {


    if (pngAlpha) {
        this.layerObject.filter = "";
        this.layerObject.backgroundImage = '';
    } else if (pngNormal) {
        this.layerObject.backgroundImage = '';
    } else {
        this.layerObject.backgroundImage = '';
    }
}
//---------------------------------------------------------------

//---------------------------------------------------------------
// global variables

// if IE5.5+ on win32, then display PNGs with AlphaImageLoader
if ((browser.isIE55 || browser.isIE6up) && browser.isWin32) {
    var pngAlpha = true;
    var strExt = ".png";
    // else, if the browser can display PNGs normally, then do that. that list includes:
    //     -Gecko Engine: Netscape 6 or Mozilla, Mac or PC
    //     -IE5+ Mac (OpacityObject applies the background image at 100% opacity)
    //     -Opera 6+ PC
    //     -Opera 5+ Mac (Doesn't support dynamically-set background images)
    //     -Opera 6+ Linux 
    //     -Omniweb 3.1+ 
    //     -Icab 1.9+ 
    //     -WebTV 
    //     -Sega Dreamcast
} else if ((browser.isGecko) || (browser.isIE5up && browser.isMac) || (browser.isOpera && browser.isWin && browser.versionMajor >= 6) || (browser.isOpera && browser.isUnix && browser.versionMajor >= 6) || (browser.isOpera && browser.isMac && browser.versionMajor >= 5) || (browser.isOmniweb && browser.versionMinor >= 3.1) || (browser.isIcab && browser.versionMinor >= 1.9) || (browser.isWebtv) || (browser.isDreamcast)) {
    var pngNormal = true;
    var strExt = ".png";
    // otherwise, we use plain old GIFs
} else {
    var strExt = ".gif";
}

var ns = (document.all) ? false : true;
var browserVersion = parseFloat(navigator.appVersion);
//---------------------------------------------------------------