function popup(page,breite,hoehe) {
   var url=page;
   var win_breite = breite + 40;
   var win_hoehe = hoehe + 20;
   var win_parameters = 'dependent=yes,scrollbars=no';
   var win_name = "viewer";
   var pos1 = (screen.availWidth-win_breite)/2;
   var pos2 = (screen.availHeight-win_hoehe)/2;
   var parameters = "left=" + pos1 + ",top=" + pos2 + ",width=" + win_breite + ",height=" + win_hoehe + "," + win_parameters;
	 var win = window.open(url,win_name,parameters);
	 win.focus();
}

function popup2(page,breite,hoehe,win_parameters) {
   var url=page;
   var win_breite = breite + 40;
   var win_hoehe = hoehe + 20;
   if ( win_parameters == "" ) win_parameters = '';
   var win_name = "viewer";
   var pos1 = (screen.availWidth-win_breite)/2;
   var pos2 = (screen.availHeight-win_hoehe)/2;
   var parameters = "left=" + pos1 + ",top=" + pos2 + ",width=" + win_breite + ",height=" + win_hoehe + "," + win_parameters;
	 var win = window.open(url,win_name,parameters);
	 win.focus();
}

// Zeigt ein Bild als Popup an
function bild ( page, image, image_width, image_height, border, center, top, left, parameters, win_name ) {
  var url = page + "?image=" + image + "&width=" + image_width + "&height=" + image_height + "&margin=" + border;
  if ( center != true && center != false ) center = true;
  if ( !parseInt ( top ) ) top = 0;
  if ( !parseInt ( left ) ) left = 0;
  if ( !parseInt ( border ) ) border = "0";
  if ( win_name == "" ) win_name = "popup";
  var win_width = image_width + border * 2;
  var win_height = image_height + border * 2;
  if ( center ) {
    pos1 = ( screen.availWidth-win_width) / 2;
    pos2 = ( screen.availHeight-win_height ) / 2;
  } else {
    pos1 = parseInt ( left );
    pos2 = parseInt ( top );
  }
  var parameters = "left=" + pos1 + ",top=" + pos2 + ",width=" + win_width + ",height=" + win_height + "," + parameters;
  var win = window.open ( url, win_name, parameters );
  win.focus();
}