var tab1 = new Image();
var tab2 = new Image();
var tab3 = new Image();
var tab4 = new Image();
var tab5 = new Image()
var tab6 = new Image();
var tab7 = new Image();
var tab8 = new Image();
var tab1_hover = new Image();
var tab2_hover = new Image();
var tab3_hover = new Image();
var tab4_hover = new Image();
var tab5_hover = new Image();
var tab6_hover = new Image();
var tab7_hover = new Image();
var tab8_hover = new Image();

tab1.src = "images/buttons/tab_03.jpg";
tab1_hover.src = "images/buttons/tab_h_03.jpg";

tab2.src = "images/buttons/tab_06.jpg";
tab2_hover.src = "images/buttons/tab_h_06.jpg";

tab3.src = "images/buttons/tab_08.jpg";
tab3_hover.src = "images/buttons/tab_h_08.jpg";

tab4.src = "images/buttons/tab_10.jpg";
tab4_hover.src = "images/buttons/tab_h_10.jpg";

tab5.src = "images/buttons/tab_12.jpg";
tab5_hover.src = "images/buttons/tab_h_12.jpg";

tab6.src = "images/buttons/tab_14.jpg";
tab6_hover.src = "images/buttons/tab_h_14.jpg";

tab7.src = "images/buttons/tab_16.jpg";
tab7_hover.src = "images/buttons/tab_h_16.jpg";

tab8.src = "images/buttons/tab_20.jpg";
tab8_hover.src = "images/buttons/tab_20_rot.jpg";


function Nav_Change(Tab, Mode) {
	document.getElementById("nav_tab_"+Tab).src = Mode.src;
	}

function closeIntro() {
	IntroFenster.close();
	}

function showIntro() {
	window.open("html/intro.html","IntroFenster","top=100, left=100, width=650, height=200").focus();
	window.setTimeout("closeIntro()", 5000);
	}