var numHalf = parseInt(numThemen/2 + 0.5);
// die bilder
var zu = new Array();
zu[0] = new Image();
zu[0].src = "/images/bett_zu1.jpg";
zu[1] = new Image();
zu[1].src = "/images/bett_zu2.jpg";

var of = new Array();
of[0] = new Image();
of[0].src = "/images/bett_offen1.jpg";
of[1] = new Image();
of[1].src = "/images/bett_offen2.jpg";

var W3C = (document.getElementById) ? 1 : 0;
function Init() {
/*
	for(i=0; i<themen.length; i++) {
		if (themen[i] == 'offen') {
			var mySrc = of[0].src;
    		if (i > (numHalf)) {
        		mySrc = of[1].src;
    		}
//			if (W3C) {
				document.images['bett' + i].src = mySrc;
//			} else {
//				document.layers['betten'].document.images['bett' + i].src = mySrc;
//			}
		}
	}
*/
}
function showTopic(nr) {
	if (themen[nr] != 'offen') {
		var mySrc = of[0].src;
		if (nr > (numHalf)) {
			mySrc = of[1].src;
		}
		if (W3C) {
			document.images['bett' + nr].src = mySrc;
		} else {
			document.layers['img' + nr].document.images['bett' + nr].src = mySrc;
		}
	}
	if (W3C) {
		if (document.getElementById('txt' + nr)) {
			document.getElementById('txt' + nr).style.visibility = "visible";
		}
	} else {
		document.layers['txt' + nr].visibility = "show";
	}	
}

function hideTopic(nr) {
	if (themen[nr] != 'offen') {
		var mySrc = zu[0].src;
		if (nr > (numHalf)) {
			mySrc = zu[1].src;
		} 
		if (W3C) {
			document.images['bett' + nr].src = mySrc;
		} else {
			document.layers['img' + nr].document.images['bett' + nr].src = mySrc;
		}
	}
	if (W3C) {
		if (document.getElementById('txt' + nr)) {
			document.getElementById('txt' + nr).style.visibility = "hidden";
		}
	} else {
		document.layers['txt' + nr].visibility = "hide";
	}
}