// 01.03.2004
// loading rollover pics for the matter menu
m1 = new Image();
m1.src = "/img/bt_inic_hi.gif";
m2 = new Image();
m2.src = "/img/bt_cont_hi.gif";
m3 = new Image();
m3.src = "/img/bt_aviso_hi.gif";

// makes all layers invisible
function clearlayers () {
	for(var i = 1; i <= 4; i++) {
		if(document.getElementById) 
			eval("document.getElementById('lay"+i+"').style.visibility = 'hidden';");
	}
}

// makes active layer visible
function showlayers (derlayer) {
	clearlayers();
	if(document.getElementById)
		eval("document.getElementById('lay"+derlayer+"').style.visibility = 'visible';");
}

// popup. aufruf: <a href="javascript:popupWindow('zoom.php',620,560)">
function popupWindow(url,w,h) {
	var venestra;
	var properties='';
	properties += 'width='+w+',';
	properties += 'height='+h+',';
	properties += 'scrollbars=yes,';
	properties += 'resizable=1,';
	properties += 'menubar=0,';
	properties += 'locationbar=0';
	venestra=window.open(url,'popup',properties);
	if (window.focus) {venestra.focus()}
	return false;
}

function changeImage(imageName,fileName) {
  var temp = fileName;
  if (document.images) {
	document[imageName].src = fileName;
  }
}

// open and close news articles
function toggleNews(news) {
	var art = document.getElementById(news);
	if (art.style.display == '') // ie6 hack
		art.style.display = "none";
	if (art.style.display == "none") 
		art.style.display = "block";
	else 
		art.style.display = "none";
	return false;
}