Pagemethods not Calling from Javascript

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C#

ASP.NET

Hi All,

I have an pagemethod to retrieve the custname from database. But while using that pagemethod call inside my javascript file it shows error like

"PageMethod not Defined"

I think PageMethods are unknown to my Javascript file...

Please give me your suggestions to solve this issue....

My Javascript contains...

function CallMe(src,dest)
 {
     var ctrl = document.getElementById(src);

     PageMethods.GetContactName(ctrl.value, CallSuccess, CallFailed, dest); //Not called
 }


 function CallSuccess(res, destCtrl)
 {
     var dest = document.getElementById(destCtrl);
     dest.value = res;
 }


 function CallFailed(res, destCtrl)
 {
     alert(res.get_message());
 }

My MasterPage Content contains...

<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true" EnablePartialRendering="true">

My code behind...

 [System.Web.Services.WebMethod]
    public static string GetContactname(string custid)
    {
//Code to retrieve custname
    }

Initialize onload...

txt_custid.Attributes.Add("onblur", "javascript: CallMe('" + txt_custid.ClientID + "', '" + txt_custname.ClientID + "')");