//preload images

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		about_on = newImage("images/about_on.gif");
		klass_on = newImage("images/klass_on.gif");
		simp_on = newImage("images/simp_on.gif");
		request_on = newImage("images/_on.gif");
		location_on = newImage("images/location_on.gif");
		preloadFlag = true;
	}
}

//Menus

var iversion = -1;

function version() {
	if (iversion != -1) return iversion;
        if(navigator.appName.indexOf("Netscape") != -1){
                if (navigator.userAgent.indexOf("Mozilla/2.0") != -1) 
                				iversion = 2;
                	else
                	    if (navigator.userAgent.indexOf("Mozilla/3.0") != -1) 
                					iversion = 3;
                			else
                        		if (navigator.userAgent.indexOf("Mozilla/4.0") != -1)
                        			iversion = 4;
                        		else
                        		    iversion = 1;
        }  else {  // Not netscape.
                if(navigator.appName.indexOf("Internet Explorer") != -1){
                     if (navigator.userAgent.indexOf("Mozilla/4.0") != -1) 
                     		iversion = 4; 
                         else	
                            iversion = 1;
                     } else 
                     	iversion = 1;
               }
	return iversion;
}


if (3 <= version()) {
nav_menu_1on = new Image();
nav_menu_1on.src = "images/about_on.gif";
nav_menu_1off = new Image();
nav_menu_1off.src = "images/about_off.gif";
nav_menu_2on = new Image();
nav_menu_2on.src = "images/tools_on.gif";
nav_menu_2off = new Image();
nav_menu_2off.src = "images/tools_off.gif";
nav_menu_3on = new Image();
nav_menu_3on.src = "images/java_on.gif";
nav_menu_3off = new Image();
nav_menu_3off.src = "images/java_off.gif";
nav_menu_4on = new Image();
nav_menu_4on.src = "images/web_on.gif";
nav_menu_4off = new Image();
nav_menu_4off.src = "images/web_off.gif";
nav_menu_5on = new Image();
nav_menu_5on.src = "images/contact_on.gif";
nav_menu_5off = new Image();
nav_menu_5off.src = "images/contact_off.gif";
}
function rollon(imgName) {
	if (3 <= iversion) {
	imgOn = eval(imgName + "on.src");
	document[imgName].src = imgOn;
	}
	var soundTest = document.ding;

    if (soundTest != null) {
    document.ding.play(false);
    }
}
function rolloff(imgName) {
	if (3 <= iversion) {
	document[imgName].src = eval(imgName + "off.src");
	}
}

//Chanched Dot


browser_name = navigator.appName;
browser_version = parseFloat(navigator.appVersion); 
if (browser_name == "Netscape" && browser_version < 2.0)	{
	roll = 'false';
	}
else if (browser_name == "Netscape" && browser_version == 2.0)	{
	roll = 'false';
	}
else if (browser_name == "Netscape" && browser_version >= 3.0)	{
	roll = 'true';
	}
else if (browser_name == "Microsoft Internet Explorer" && browser_version <= 2.0)	{
	roll = 'false';
	}
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0)	{
	roll = 'true';
	}
else	{
	roll = 'false';
	}
function msover(img,ref)	{

		if (roll == 'true')			{
			document.images[img].src = ref;
			}
	}
function msout(img,ref)	{
		if (roll == 'true')			{
			document.images[img].src = ref;
			}
	}
function msover2(img1,ref1,img2,ref2)	{
		if (roll == 'true')			{
			document.images[img1].src = ref1;
			document.images[img2].src = ref2;
			}
	}
function msout2(img1,ref1,img2,ref2)	{
		if (roll == 'true')			{
			document.images[img1].src = ref1;
			document.images[img2].src = ref2;
			}
	}