var req;
function ajaxCall(p_submitMethod, p_parameters, p_url, p_targetDiv) 
   {   
    
    document.getElementById(p_targetDiv).innerHTML = 'Request Processing...';
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        //req.onreadystatechange = function() { ajaxResponse(p_targetDiv); };
        
        req.onreadystatechange = function() { checkSubscriber(p_targetDiv); };
        
        if (p_submitMethod == "POST") {
            req.open("POST", p_url, true);
            req.send(p_parameters);
        }
        else {
            req.open("GET", p_url, true);
            req.send(null);
        }

    } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
        if (req) {
            req.onreadystatechange = function() { ajaxResponse(p_targetDiv); };

            if (p_submitMethod == "POST") {
                req.open("POST", p_url, true);
                req.send(p_parameters);
            }
            else {
                req.open("GET", p_url, true);
                req.send();
            }


        }
    }
}

function checkSubscriber(p_targetDiv)
{    
     
       if (req.readyState == 4) {
    
        if (req.status == 200 || req.status == 304) {
            results = req.responseText;
            
          
            if(results==0)
            {
                alert("Your email already exists in subscribtion list.");
                document.getElementById(p_targetDiv).innerHTML="";
                return false;                
            }
            else
            {                            
               alert("Your request has been submitted.");
               document.getElementById(p_targetDiv).innerHTML="";
               return false;                
            }
             
            
        } 
        else 
        {
            //document.getElementById(p_targetDiv).innerHTML = "Some Error :" + req.statusText;
        }
    }
}


function ajaxResponse(p_targetDiv) {
    
    if (req.readyState == 4) {
    
        if (req.status == 200 || req.status == 304) {
            results = req.responseText;
            //alert(results); Use for Debugging...
            document.getElementById(p_targetDiv).innerHTML = results;

        } else {
            document.getElementById(p_targetDiv).innerHTML = "Some Error :" + req.statusText;
        }
    }
}

function createTimestamp() {
    return "timestamp=" + new Date().getTime().toString();
}