function popup(theURL,winName,winwidth,winheight) {
	var links = (screen.width/2)-(winwidth/2);
	var oben = (screen.height/2)-(winheight/2);
	var features = "width="+winwidth+",height="+winheight+",left="+links+",top="+oben; 
	window.open(theURL,winName,features);
}

function switchon(name){
	document[name].src = eval(name + "_on.src");
}

function switchoff(name){
	document[name].src = eval(name + "_off.src");
}

function switch_text(content_nr) { 
	document.all.headline.innerHTML = "AKTUELLES";
	document.all.content.innerHTML = content_nr;
}