Textbox not accepting Apostrophe in javascript..

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ASP.NET

Javascript

Heloo Friends,

I am using visual studio 2005.I have written following code for the'onblur' event of textbox using javascript.

whenever i enter text with Apostrophe then it writtens null value.I dont know where is the issue.I also debugged it and found that ajax throwing error.Please help me as its urgent.

function txtBlurNarr(obj) {
           if (document.getElementById('<%=txtnarr.ClientID%>').value == "") {
           }
           else {
               var narr = document.getElementById('<%=txtnarr.ClientID%>').value;
               var passpar = narr;
               debugger;
               $(document).ready(function() {
                   //     alert("Inside Jquery");
                   $.ajax({
                       type: "POST",
                       url: "jstest.aspx/CheckoutNarr",
                       data: "{'parameter':'" + passpar + "'}",
                       contentType: "application/json; charset=utf-8",
                       dataType: "json",
                       async: true,
                       cache: false,
                       success: function(msg) {
                           var retvalue = msg.d;
                       }
                   })
                   return false;
               });
           }
       }

thanks in advance.