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How To pass more than two variable in ajax

function getdiscountvalue(str)
{

var xmlhttp;
var cost =  document.getElementById("cost").value;
var url2 ='ajaxoffer.php?id='+str+'&cost='+cost;
//alert(url2);
if (str.length==0)
  {
  document.getElementById("disvalue").value="";
  return;
  }
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("disvalue").value=xmlhttp.responseText;
    }
  }
xmlhttp.open("GET",url2,true);
xmlhttp.send();
}


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