var loadHtml = "<div style='margin: 60px auto; width: 500px;  text-align: center;'><span style='padding-top:15px; text-align:right; color:#9b9b9b;font-size:12px;'>" +
            "<img alt='load' src='script/jstree/themes/ajax-loader.gif' align='absMiddle'  bold='0'  /></span></div> ";
            $.ajax({
                type: "get",
                url: strUrl,
                data: "",
                dataType: "html",
                beforeSend: function() {
                    window.frames['rightFrame'].document.body.innerHTML = loadHtml;
                },
                success: function(msg) {
  
                  // window.frames['rightFrame'].document.dom.innerHTML =eval(msg);
                 document.getElementById("rightFrame").src=strUrl;

                }
            });