function setImage(name, src) {
	if (document.images) {
		document.images[name].src = src;
	}
}

function showChannel(channelId, imageId) {
	var src = getImagePathFor(channelId, 'menu_on.gif');
	setImage(imageId, src);
}

function hideChannel(channelId, imageId) {
	var src = getImagePathFor(channelId, 'menu.gif');
	setImage(imageId, src);
}

function getImagePathFor(channelId, extension) {
	var path = '../images/channels/' + channelId;
	path = path + '/'+ extension;
	return path;
}


function showArrow(imageId) {
	var src = '../images/arrow_on.gif';
	setImage(imageId, src);
}

function hideArrow(imageId) {
	var src = '../images/arrow.gif';
	setImage(imageId, src);
}

	var loaded = false;
		
		var imgpath = "images/startpage/"
		
		function showImage(name) {
			if(document.images && loaded) {
				document.images['home_1'].src =  imgpath + name + '_1.gif';
				document.images['home_2'].src =  imgpath + name + '_2.gif';
				document.images['home_3'].src =  imgpath + name + '_3.gif';
				document.images['home_4'].src =  imgpath + name + '_4.gif';
				document.images['home_5'].src =  imgpath + name + '_5.gif';
				document.images['home_6'].src =  imgpath + name + '_6.gif';
				document.images['home_7'].src =  imgpath + name + '_7.gif';
			}
		}
		
		
		function preload() {
			if(document.images) {
				var keys = new Array("home", "unternehmensberatung", "steuerberatung", "abschlusspruefung", "unternehmensrecht", "unternehmensgruendung","service");
				var img = new Array(50);
				for(i=0; i<keys.length; i++) {
					for(j=1; j<8; j++) {
						index = i*7 + j;
						img[index] = new Image();
						src = imgpath + keys[i] + '_' + j + '.gif'; 
						img[index].src = src;
					}
				}
				
				loaded = true;
			}
		
		}