var req;
var mode;

function AddToCarriage(id) {
 rnb=Math.random()*555;
 lid=id;
 url = 'carriage.php?prod_id='+id+'&'+rnb;
 if (window.XMLHttpRequest) {
    req = new XMLHttpRequest();
    req.onreadystatechange = processReqChange;
    req.open("GET", url, true);
    req.send(null);
  }

  else if (window.ActiveXObject) {
      req = new ActiveXObject("Microsoft.XMLHTTP");
      if (req) {
        req.onreadystatechange = processReqChange;
        req.open("GET", url, true);
        req.send();
      }
    }
  }

 function processReqChange() {
   if (req.readyState == 4 && req.status == 200) {
      res=req.responseText;
      //alert(res);
      document.getElementById('carriage').innerHTML=res;
      document.getElementById('wait').style.display="none";
   }

   if (req.readyState == 1) {
      document.getElementById('wait').style.display="block";
      //document.getElementById('button').disabled=true;
   }
 }