var browser = 0;
var lb = "0";
var imgload = new Array("friends","mnu_friends-alien.gif","mnu_friends-earth.gif",
"art","mnu_art-kandinsky.gif","mnu_art-sbahn.gif",
"pc","mnu_pc-dark.gif","mnu_pc-shine.gif",
"tw","mnu_tw-soul.gif","mnu_tw-waterboy.gif");

    if (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || 
       ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )) ||
	   ((navigator.appName == "Opera") && (parseInt(navigator.appVersion) >=6)) )  browser=1;

	if (browser==1) {
		
		friends = new Image();
		friends.src = "imgs/mnu_friends-alien.gif";
		friends_over = new Image();
		friends_over.src = "imgs/mnu_friends-earth.gif";

		pc = new Image();
		pc.src = "imgs/mnu_pc-dark.gif";
		pc_over = new Image();
		pc_over.src = "imgs/mnu_pc-shine.gif";

		tw = new Image();
		tw.src = "imgs/mnu_tw-soul.gif";
		tw_over = new Image();
		tw_over.src = "imgs/mnu_tw-waterboy.gif";

		art = new Image();
		art.src = "imgs/mnu_art-kandinsky.gif";
		art_over = new Image();
		art_over.src = "imgs/mnu_art-sbahn.gif";

		email = new Image();
		email.src = "imgs/borlb.gif";
		email_over = new Image();
		email_over.src = "imgs/go_email-t.gif";

		ad = new Image();
		ad.src = "imgs/ad_thomsson.gif";
		ad_over = new Image();
		ad_over.src = "imgs/ad_go_thomsson.gif";
	}

function img_over(imgName) {
	if (browser == 1) {
		imgOver = eval(imgName + "_over.src");
		document.getElementsByName(imgName)[0].src= imgOver;
		//document [imgName].src = imgOver;
	}
}

function img_out(imgName) {
	if (browser == 1) {
		imgOut = eval(imgName + ".src");
		document.getElementsByName(imgName)[0].src=imgOut;
		//document [imgName].src = imgOut;
	}
}

function show(text) {
	window.status=text;
	return true;
}

var styles = new Array("normal","additiv","subtraktiv","fallsheller","fallsdunkler","filter","multiplizieren","differenz","struktur","farbe","farbton","saettigung", "helligkeit","rot","gruen","blau","invertieren","schicht","bildschirm","harteslicht","weicheslicht","farbsprung","farbbrand","aufloesen50");
var styleTimer;
var bg="style1Bg";
var a=0;
function change() {
	a++;
	if (a>=styles.length) a=0;
	if (bg=="style1Bg") { bg="style2Bg"; var bg2="style1Bg"; } else { bg="style1Bg"; var bg2="style2Bg"; }

	document.getElementById(bg).style.height="0px";
	document.getElementById(bg).style.backgroundImage="url(imgs/main-"+styles[a]+".gif)";
	document.getElementById(bg).style.zIndex="20";
	document.getElementById(bg2).style.zIndex="10";
	styleTimer = setInterval("style_rolldown()",50);
}

function style_rolldown() {
	if (document.getElementById(bg).offsetHeight>570) { clearInterval(styleTimer); setTimeout("change();",1000); }
	document.getElementById(bg).style.height=document.getElementById(bg).offsetHeight+5+"px";
}

function style_stop() {
	clearInterval(styleTimer);
}

function start() {
	mainBg.style.visibility='visible';loadingBg.style.display='none';
	setTimeout("introduceLinks(0);",1000);
}

function introduceLinks(s) {
	if (s==0 || s==4) var si = "pc";
	if (s==1 || s==5) var si = "art";
	if (s==2 || s==6) var si = "friends";
	if (s==3 || s==7) var si = "tw";
	
	if (s<4) img_over(si); else img_out(si);
	if (s<7) setTimeout("introduceLinks("+(s+1)+")",100);
}