function xmlhttpPost(strURL,sel) {
   var xmlHttpReq = false;
   var self = this;
   // Mozilla/Safari
   if (window.XMLHttpRequest) {
      self.xmlHttpReq = new XMLHttpRequest();
   }
   // IE
   else if (window.ActiveXObject) {
      self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
   }
   self.xmlHttpReq.open('POST', strURL, true);
   self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
   self.xmlHttpReq.onreadystatechange = function() {
      if (self.xmlHttpReq.readyState == 4) {
         updatepage(self.xmlHttpReq.responseText,sel);
      }
      else {
         show_standby();
      }
   }
   self.xmlHttpReq.send(getquerystring(sel));
}

function trim(sString)
{
   while (sString.substring(0,1) == ' ')
   {
      sString = sString.substring(1, sString.length);
   }
   while (sString.substring(sString.length-1, sString.length) == ' ')
   {
      sString = sString.substring(0,sString.length-1);
   }
   return sString;
}