/**
 * Allgemeine Popup-Funktion:
 */
	function popup ( url, name, args, callback )
	{
		if ( typeof name == undefined ) name = 'popup';
		if ( typeof args == undefined ) args = '';
	
		var popup = window.open ( url, name, args );
			
		if ( typeof callback == 'function' ) callback ( popup );
		
		popup.focus ( );
	}