function fenster(winname,breite,hoehe) {
	var links=screen.width/2-breite/2;
	var oben=screen.height/2-hoehe/2;
	NewWin = window.open(winname, "titel", "width="+breite+",height="+hoehe+",top="+oben+",left="+links);
}

	<!--
	if (document.layers){
	window.captureEvents(Event.MOUSEDOWN | Event.MOUSEUP)
	window.onmousedown=rightclick;
	window.onmouseup=rightclick;
	function rightclick(e) {
	if (e.which == 3) {
	// Put right mouse code here
	alert('');
	return false;
	}
	else {
	return true;
	}
	}
	}
	if (document.all){
	function click() {
	if (event.button==2) {
	alert('')
	}
	if (event.button==3) {
	alert('')}
	}
	document.onmousedown=click
	}
	// -->
	
function click (e) {
if (!e)
e = window.event;
if ((e.type && e.type == "contextmenu") || (e.button && e.button == 2) || (e.which && e.which == 3)) {
if (window.opera)
window.alert("");
return false;
}
}
if (document.layers)
document.captureEvents(Event.MOUSEDOWN);
document.onmousedown = click;
document.oncontextmenu = click;

function disableselect(e){
return false
}
function reEnable(){
return true
}
document.onselectstart=new Function ("return false")
if (window.sidebar){
document.onmousedown=disableselect
document.onclick=reEnable
}