function popup(URL, name, width, height, scrollbars, toolbar)
{
	var ns6 = (!document.all && document.getElementById);
	var ie4 = (document.all);
	var ns4 = (document.layers);
	var breite, hoehe, eigenschaften;
	
	if(ns6||ns4) {
		breite = innerWidth;
		hoehe = innerHeight;
	}
	else if(ie4) {
		breite = document.body.clientWidth;
		hoehe = document.body.clientHeight;
	}
	
	var left = (screen.availWidth / 2) - (width / 2);
	var top = (screen.availHeight / 2) - (height / 2);
	
	eigenschaften = "width=" + width + ",height=" + height + ",left=" + left + ",top=" + top + ", scrollbars=" + scrollbars + ", toolbar=" + toolbar;
	
	fenster = window.open(URL, name,eigenschaften);
	fenster.resizeTo(width, height);
	fenster.moveTo(left, top);
	fenster.focus();
	
	if(fenster) {
		return false;
	}
	else {
		return true;
	}
}