function showDiv(arg0) {
		http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
            http_request.overrideMimeType('text/xml');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
     //    alert('Cannot create XMLHTTP instance');
         return false;
      }
	  var status = false;
	  var element = document.getElementById(arg0);
	  if (element.style.display == 'none') {
		  status = 1;
		  element.style.display = 'block';
	  }
	  else 
	  {
		  status = 0;
		  element.style.display = 'none';
	  }
	  http_request.open('POST', 'index.php?show=navigatorstatus&cat='+arg0+'&actief='+status, true);
	  http_request.send('');
}