var userName = '';

$(document).ready(function() 
{
    $("#btnEmail").click(function()
    {
       $("#divLoader").css("display","block");
       userName = document.getElementById('txtToEmail').value; 
       var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
       if (reg.test(userName)==false)
       {
           alert("Your email address seems incorrect. Please try again.");
           document.getElementById('txtToEmail').focus();
           document.getElementById('txtToEmail').value="";
           $("#divLoader").css("display","none");
           return false;
       }
        $.ajax(
        {
            type:"POST",
            url:"Services/CommonServices.asmx/CheckEmailAvailability",
            data:"{\"email\":\"" + userName + "\"}",
            dataType:"json",
            contentType:"application/json",
            success: function(response) 
            {
                if(response == false) 
                {
                    $("#display").text("Subscribe for Newsletter.");
                }
                else
                {
                  $("#display").text("Email is already Subscribed.");
                  document.getElementById('txtToEmail').focus();
                }
                $("#divLoader").css("display","none");
            }
        });
    });
});