var neues_Fenster = null;
var url;
var breite;
var hoehe;
function popup(url0, breite0, hoehe0){
	popdown();
	url = url0;
	breite = breite0;
	hoehe = hoehe0;
	setTimeout("neuesFenster()",300);
	return (neues_Fenster) ? false : true;
}
function popdown()
{
	if (neues_Fenster != null){
		if (!neues_Fenster.closed){
			if (neues_Fenster.close){
				neues_Fenster.close();
			}
		}
	}	
}
function neuesFenster(){	
		optionen = 'toolbar=0,location=0,directories=0,status=0,top=100,left=100,menubar=0,scrollbars=0,resizable=0,height='+hoehe+',width='+breite;
		neues_Fenster = window.open(url,"Informationen",optionen);		
}
window.onunload = popdown;