//öffnet Popup der übergebenen Größe, indem die übergebene URL angeziegt wird
function openPopup(url,title,width, height,resize){
	if (typeof title == "undefined"){
		title = 'PopUp';
	}
	if(typeof width == "undefined"){
		width = 800;
	}
	if(typeof height == "undefined"){
		height = 600;
	}
	if(typeof resize == "undefined"){
		resize = ''
	}else if (resize){
		resize = ',resizable';
	}else{
		resize = '';
	}
	
	if (navigator.appName.indexOf("Opera") != -1){
		width = width + 0;
		height = height + 0;
	}else if (navigator.appName.indexOf("Explorer") != -1){
		width = width + 40;
		height = height + 40;
	}else if (navigator.appName.indexOf("Netscape") != -1){
		width = width + 17;
		height = height + 17;
	}else{
		width = width + 20;
		height = height + 20;
	}
	if(typeof url != "undefined"){
		var pp = window.open(
			url, 
			title, 
			"width="+width+","+
			"height="+height+
			resize
		);
  		pp.focus();
	}else{
		alert('gib wenigstens eine URL an.');
	}
}