function changetabs(){
  var http_request = false;
  if (window.XMLHttpRequest) { // Mozilla, Safari, ...
	http_request = new XMLHttpRequest();
	if (http_request.overrideMimeType) {
	  http_request.overrideMimeType('text/xml');
	                // See note below about this line
	}
  } 
  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) {
	return false;
  }
  var arrStr = '';
  for(i = 0; i < tabobj.labels.length; i++){
    for(j = 0; j < tabobj.labels[i].length; j++){
      arrStr += '&array' + i + '[]=' + tabobj.labels[i][j];
    }
  }
  var urlstr = 'changeSubCat.php?evDelim=' + tabobj.evDelim + '&evDParent=' + tabobj.evDParent + '&hpName=' + tabobj.hpName 
     + '&spName=' + tabobj.spName + '&tFocus=' + tabobj.tFocus + '&stFocus=' + tabobj.stFocus + arrStr + '&arrNodes=' + tabobj.labels.length;
 // document.getElementById('subCat').innerHTML = urlstr;
  http_request.onreadystatechange = function() { ctSetSelect(http_request); };
  http_request.open('GET', urlstr, true);
  http_request.send(null);

}
          
function ctSetSelect(http_request) {
  if (http_request.readyState == 4) {
    if (http_request.status == 200) {
      var tabbox = http_request.responseText;
	    document.getElementById('subCat').innerHTML =  tabbox;
	}
    else {
      alert('There was a problem with the request.');
    }
  }
}