asp.NetupdatepanelによるJSのロードができず、使用できない解決方法

 
  
 
  <br>    var prm = Sys.WebForms.PageRequestManager.getInstance(); 
  <br>    prm.add_endRequest(function () { 
  <br>        // re-bind your jquery events here  
  <br>        $(document).ready(function () { 
  <br> 
  <br>            //begin 
  <br>            var span = $("input[id*='txtSpan']"); 
  <br>            span.focusout(function () { 
  <br>                var greaterthenzero = (span.val() == 0); 
  <br>                if (span.val() == 0) { 
  <br>                    $("#spRule").show(); 
  <br>                    $("input[id*='btnSave']").attr("disabled","disabled"); 
  <br>                } 
  <br>                else { 
  <br>                    $("#spRule").hide(); 
  <br>                    $("input[id*='btnSave']").removeAttr("disabled"); 
  <br>                } 
  <br>            }); 
  <br>            //end 
  <br> 
  <br>        }); 
  <br>    } 
  <br> ); 
  <br>