Jquery Dialog not working

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ASP.NET

jQuery

jQuery-UI

Hello ,
My Dialog is not working. when i click on button, nothing happens.THis is the code that i am using

function openPop(url, divClass, title, width, height,btnOk) {
                var b = [];
                if (btnOk) {
                    b = [
        {
            text: "OK",
            click: function () { jQuery("." + divClass).dialog('destroy'); }
        }
        ];
                }
                var ifr = jQuery("." + divClass).find('iframe');

                jQuery("." + divClass).dialog({
                    modal: true,
                    autoOpen: true,
                    title: title,
                    width: width,
                    height: height,
                    resizable: false,
                    position: {
                        my: "center",
                        at: "center",
                        of: window,
                        within: window
                    },
                    buttons: b,
                    open: function () {
                        setTimeout(function () {
                            jQuery(ifr).attr('src', url);
                        }, 10);
                    },
                    close: function () {
                        jQuery(ifr).attr('src', 'about:blank');
                        jQuery(this).dialog('destroy');
                    }

                });
            }

this is how i call this function

$(".btn").click(function () {
              openPop('<%= Request.ApplicationPath%>/StoreManagement/AddNew.aspx', 'divPop', 'Add New Store', 650, 550);
              return false;
          });

whenever i click the button only page blurs for a moment and then returns to it's original state. This code works fine with jquery 1.6.something. now i am trying to use it with jquery 2.1.something but not working here.