mousePath = 'images/';
mouseNames = new Array('bt_praxis', 'bt_fachinfos', 'bt_links', 'bt_sprechzeiten', 'bt_home');
mouseImg = new Array(mouseNames.length);

if (document.images) {
	for (i = 0; i < mouseNames.length; i++) {
		mouseImg[i] = new Image();
		mouseImg[i].src = mousePath + mouseNames[i] + '1.gif';
	}
}

function showImg(imgName) {
	if (document.images) {
		document.images[imgName].src = mousePath + imgName + '1.gif';
	}
}

function hideImg(imgName) {
	if (document.images) {
		document.images[imgName].src = mousePath + imgName + '0.gif';
	}
}