function postXMLDoc(url,params,type) {
   delete req;
   if (window.XMLHttpRequest) {
      try {
            req = new XMLHttpRequest();
      } catch(e) {
            req = false;
      }
   } else if(window.ActiveXObject) {
      try {
            req = new ActiveXObject("Msxml2.XMLHTTP");
      } catch(e) {
         try {
            req = new ActiveXObject("Microsoft.XMLHTTP");
         } catch(e) {
            req = false;
         }
      }
   }
   if (req) {
      req.onreadystatechange = function() { processReqChange(type) };
      req.open("POST", url+params, true);
      req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      req.setRequestHeader("Content-length", params.length);
      req.setRequestHeader("Connection", "close");
      req.send(params);
   }
}

function getXMLDoc(url,type) {
   delete req;
   if (window.XMLHttpRequest) {
      try {
         req = new XMLHttpRequest();
      } catch(e) {
         req = false;
      }
   } else if(window.ActiveXObject) {
      try {
         req = new ActiveXObject("Msxml2.XMLHTTP");
      } catch(e) {
         try {
            req = new ActiveXObject("Microsoft.XMLHTTP");
         } catch(e) {
            req = false;
         }
      }
   }
   if (req) {
      req.onreadystatechange = function() { processReqChange(type) };
      req.open("GET", url, true);
      req.send(null);
   }
}