jquery accordion menü, submenü offen halten

<div id='cssmenu'>
<ul>
   <li><a href='http://mastazone.de'><span>Home</span></a></li>
   <li><a href='#'><span>Test1</span></a>
      <ul>
         <li><a href='/?ausw=test1.1'>Test1.1</a></li>
         <li><a href='/?ausw=test1.2'>Test1.2</a></li>
      </ul>
   </li>
   <li><a href='#'><span>Test2</span></a>
      <ul>
         <li><a href='/?ausw=test2.1'>Test2.1</a></li>
         <li><a href='/?ausw=test2.2'>Test2.2</a></li>
      </ul>
   </li>
   <li><a href='#'><span>Test3</span></a></li>
</ul>
</div>

$(document).ready(function(){




  $('#cssmenu > ul > li:has(ul)').addClass("has-sub");




  $('#cssmenu > ul > li > a').click(function() {
    var checkElement = $(this).next();

    $('#cssmenu li').removeClass('active');
    $(this).closest('li').addClass('active');    


    if((checkElement.is('ul')) && (checkElement.is(':visible'))) {
      $(this).closest('li').removeClass('active');
      checkElement.slideUp('normal');
    }

    if((checkElement.is('ul')) && (!checkElement.is(':visible'))) {
      $('#cssmenu ul ul:visible').slideUp('normal');
      checkElement.slideDown('normal');
    }

    if (checkElement.is('ul')) {
      return false;
    } else {
      return true;    
    }        
  });




});

#cssmenu,
#cssmenu ul,
#cssmenu li,
#cssmenu a {
  margin: 0;
  padding: 0;
  border: 0;
  list-style: none;
  font-weight: normal;
  text-decoration: none;
  line-height: 1;
  font-family: 'Open Sans', sans-serif;
  font-size: 1em;
  position: relative;
}
#cssmenu {
  width: 150px;
  border-bottom: 4px solid #656659;
  -webkit-border-radius: 3px;
  -moz-border-radius: 3px;
  border-radius: 3px;
}
#cssmenu a {
  line-height: 1.3;
}
#cssmenu > ul > li:first-child {
  background: #66665e;
  background: -moz-linear-gradient(#66665e 0%, #45463d 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #66665e), color-stop(100%, #45463d));
  background: -webkit-linear-gradient(#66665e 0%, #45463d 100%);
  background: linear-gradient(#66665e 0%, #45463d 100%);
  border: 1px solid #45463d;
  -webkit-border-radius: 3px 3px 0 0;
  -moz-border-radius: 3px 3px 0 0;
  border-radius: 3px 3px 0 0;
}
#cssmenu > ul > li:first-child > a {
  padding: 15px 10px;
  background: url(/menu_images/pattern.png) top left repeat;
  border: none;
  border-top: 1px solid #818176;
  -webkit-border-radius: 3px 3px 0 0;
  -moz-border-radius: 3px 3px 0 0;
  border-radius: 3px 3px 0 0;
  font-family: 'Ubuntu', sans-serif;
  text-align: center;
  font-size: 1.2em;
  font-weight: 300; 
  text-shadow: 0 -1px 1px #000000;
}
#cssmenu > ul > li:first-child > a > span {
  padding: 0;
}
#cssmenu > ul > li:first-child:hover {
  background: #66665e;
  background: -moz-linear-gradient(#66665e 0%, #45463d 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #66665e), color-stop(100%, #45463d));
  background: -webkit-linear-gradient(#66665e 0%, #45463d 100%);
  background: linear-gradient(#66665e 0%, #45463d 100%);
}




#cssmenu > ul > li {
  background: #e94f31;
  background: -moz-linear-gradient(#e94f31 0%, #d13516 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #e94f31), color-stop(100%, #d13516));
  background: -webkit-linear-gradient(#e94f31 0%, #d13516 100%);
  background: linear-gradient(#e94f31 0%, #d13516 100%);
}
#cssmenu > ul > li:hover {
  background: #e84323;
  background: -moz-linear-gradient(#e84323 0%, #c33115 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #e84323), color-stop(100%, #c33115));
  background: -webkit-linear-gradient(#e84323 0%, #c33115 100%);
  background: linear-gradient(#e84323 0%, #c33115 100%);
}
#cssmenu > ul > li > a {
  font-size: .9em;
  display: block;
  background: url(/menu_images/pattern.png) top left repeat;
  color: #ffffff;
  border: 1px solid #ba2f14;
  border-top: none;
  text-shadow: 0 -1px 1px #751d0c;
}
#cssmenu > ul > li > a > span {
  display: block;
  padding: 12px 10px;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  border-radius: 4px;
}
#cssmenu > ul > li > a:hover {
  text-decoration: none;
}
#cssmenu > ul > li.active {
  border-bottom: none;
}
#cssmenu > ul > li.has-sub > a span {
  background: url(/menu_images/icon_plus.png) 96% center no-repeat;
}
#cssmenu > ul > li.has-sub.active > a span {
  background: url(/menu_images/icon_minus.png) 96% center no-repeat;
}




#cssmenu ul ul {
  display: none;
  background: #fff;
  border-right: 1px solid #a2a194;
  border-left: 1px solid #a2a194;
}
#cssmenu ul ul li {
  padding: 0;
  border-bottom: 1px solid #d4d4d4;
  border-top: none;
  background: #f7f7f7;
  background: -moz-linear-gradient(#f7f7f7 0%, #ececec 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #f7f7f7), color-stop(100%, #ececec));
  background: -webkit-linear-gradient(#f7f7f7 0%, #ececec 100%);
  background: linear-gradient(#f7f7f7 0%, #ececec 100%);
}
#cssmenu ul ul li:last-child {
  border-bottom: none;
}
#cssmenu ul ul a {
  padding: 10px 10px 10px 25px;
  display: block;
  color: #676767;
  font-size: .8em;
  font-weight: normal;
}
#cssmenu ul ul a:before {
  content: '\00BB';
  position: absolute;
  left: 10px;
  color: #e94f31;
}
#cssmenu ul ul a:hover {
  color: #e94f31;
}