var its;
var browserName;
var browserNameLong;
var browserNew;
var preloadFlag = false;
var Macintosh = navigator.userAgent.indexOf('Mac')>0;

/* get the browser and platform */
function its() {
    
    var n = navigator;
    var ua = ' ' + n.userAgent.toLowerCase();
    var pl = n.platform.toLowerCase();
    var an = n.appName.toLowerCase();
    
    this.version = n.appVersion;
    this.nn = ua.indexOf('mozilla') > 0;
    
    if(ua.indexOf('compatible') > 0) {
        this.nn = false;
    }
    
    this.opera = ua.indexOf('opera') > 0;
    this.ie = ua.indexOf('msie') > 0;
    this.major = parseInt( this.version );
    this.minor = parseFloat( this.version );
    
    this.mac = ua.indexOf('mac') > 0;
    this.win = ua.indexOf('win') > 0;
    
    if(this.ie) {
        if(ua.indexOf("msie 5") > 1) {
        var msieIndex = navigator.appVersion.indexOf("MSIE") + 5;
        this.major = parseFloat(navigator.appVersion.substr(msieIndex,3));
        }
    }
    return this;
}

/* get the browser name */
function browserNaming() {
    
    its = new its();
    
    if (!document.getElementById) {
        browserNew = false;
    }
    else {
        browserNew = true;
    }
    
    if (its.opera) {
        browserName = "Opera";
    }
    else if (its.ie) {
        browserName = "IE";
    }
    else {
        browserName = "NS";
    }
    
    browserNameLong = browserName + its.major;
}

/* DOM set property */
function setIdProperty(id, property, value) {
    var styleObject = document.getElementById(id);
    if (styleObject != null) {
        styleObject = styleObject.style;
        styleObject[property] = value;
    }
}

/* show a hidden layer */
function show(id) {
    if (browserNew) {
        setIdProperty(id, "visibility", "visible");
    }
    else {
        if (browserName == "NS") {
            document.layers[id].visibility = "show";
        } else {
            document.all[id].style.visibility = "visible";
        }
    }
}

/* hide a visible layer */
function hide(id) {
    if (browserNew) {
        setIdProperty(id,"visibility","hidden");
    }
    else {
        if (browserName == "NS") {
            document.layers[id].visibility = "hide";
        } else {
            document.all[id].style.visibility = "hidden";
        }
    }
}

/* image preloading */
function preload(imgName, imgSrc) {
    if (loadFlag) {
        eval(imgName + ' = new Image()');
        eval(imgName + '.src = "' + imgSrc + '"');
        return imgName;
    }
}

/* turn image on */
function mson(imgName) {
    document[imgName].src = eval(imgName + "_on.src");
}

/* turn image off */
function msoff(imgName) {
    document[imgName].src = eval(imgName + "_off.src");
}

/* switch an image */
function changeImg(imgName, newImg) {
    document[imgName].src = eval(newImg + ".src");
}

/* open new centered window */


function openWin(url,popW,popH) {
        version = navigator.appVersion;
	var w = 800, h = 600;
        if (version.toLowerCase().indexOf("mac")!=-1) {
                    popW = eval("popW-18");
        }
	if (document.all || document.layers) {
		w = screen.availWidth;
		h = screen.availHeight;
	}
	var leftPos = (w-popW)/2, topPos = (h-popH)/2;
	window.open(url,'popup','width=' + popW + ',height=' + popH + ',scrollbars=yes,toolbar=no,status=yes,resizable=no,top=' + topPos + ',left=' + leftPos);void(0);
}


function playerPop(url,popW,popH) {
        version = navigator.appVersion;
	var w = 800, h = 600;

	if (document.all || document.layers) {
		w = screen.availWidth;
		h = screen.availHeight;
	}
	var leftPos = (w-popW)/2, topPos = (h-popH)/2;
	window.open(url,'popup','width=' + popW + ',height=' + popH + ',scrollbars=no,toolbar=no,status=yes,resizable=no,top=' + topPos + ',left=' + leftPos);void(0);
}


function helpPop(url,popW,popH) {
        version = navigator.appVersion;
	var w = 800, h = 600;

	if (document.all || document.layers) {
		w = screen.availWidth;
		h = screen.availHeight;
	}
	var leftPos = (w-popW)/2, topPos = (h-popH)/2;
	window.open(url,'','width=' + popW + ',height=' + popH + ',scrollbars=no,toolbar=no,status=yes,resizable=no,top=' + topPos + ',left=' + leftPos);void(0);
}