function createRequestObject() {
    var ro;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        ro = new XMLHttpRequest();
    }
    return ro;
}

var http = createRequestObject();

function setPricing(obj, pid)
{
	
	var url = "ajax.php";
	var data = "pid=" + pid + "&qty=" + obj.value;

	http.open("POST", url, true);
	http.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    http.send(data);
	http.onreadystatechange = showResponse;

}

function showResponse() {
  if (http.readyState == 4) {
    if (http.responseText.indexOf('invalid') == -1) {
      qresults = http.responseText.split("***");
	  var count = qresults.length;
	  	  
			for (var i=0;i<qresults.length;i++)
			{
		      details = qresults[i].split("---");
			  document.getElementById(details[0]).innerHTML = details[1];	      
			}

    }

  }
}