function open_shop(){
					url="http://www.paradeshop.de/shop/index_shop.html";
					windowwidth=780;
					windowheight=600;
                  // Berechnung der Mitte

                  if (document.all){
                      var breite = screen.width;
                      var hoehe = screen.height;
                  }
                  else {
                      if (document.layers){
                           var breite = window.outerWidth;
                           var hoehe = window.outerHeight;
                      }
                  }

                  var left = (breite - windowwidth) / 2;
                  var top = (hoehe - windowheight) / 2;

                  my_new_window = window.open (url, "wkc", "menubar=no,toolbar=no,status=no,resizable=no,scrollbars=no,width="+windowwidth+",height="+windowheight+", screenX="+left+",screenY="+top+",top="+top+",left="+left+"");

        }