var xmlHttp
var fieldName

function updateSvc(svc) {
 xmlHttp=GetXmlHttpObject();
 if (xmlHttp==null) {
  alert ("Your browser does not support AJAX!");
  return;
 } 
 var url="updateSvc.php";
 url=url+"?svc="+svc;
 xmlHttp.onreadystatechange=stateChanged;
 xmlHttp.open("GET",url,true);
 xmlHttp.send(null);
}

function stateChanged() { 
 if (xmlHttp.readyState==4) { 
  /*document.getElementById(fieldName).innerHTML=xmlHttp.responseText;*/
 }
}

function GetXmlHttpObject() {
 var xmlHttp=null;
 try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
 catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
 return xmlHttp;
}