check extn

 if (hasError == true || hasError == "true") {
            if ($("#editFilePhotosExpense").val() != "") {
                var name2 = $('#editFilePhotosExpense').val();
                name2 = name2.replace("C:\\fakepath\\", "");
                var fileInput = $("#editFilePhotosExpense")[0];
                try {
                    var fileSize = 0;
                    //for IE
                    if ($.browser.msie) {
                        //before making an object of ActiveXObject,
                        //please make sure ActiveX is enabled in your IE browser
                        var objFSO = new ActiveXObject("Scripting.FileSystemObject");
                        var filePath = $("#editFilePhotosExpense")[0].value;
                        var objFile = objFSO.getFile(filePath);
                        fileSize = objFile.size;
                        //size in kb fileSize = fileSize / 1048576; //size in mb 
                    }
                    else {
                        fileSize = fileInput.files[0].size;
                    }
                }
                catch (err1) {
                    alert('Tools -> Internet Options -> choose the Security tab Click the Custom Level button Enable the following settings: Run ActiveX controls and plug-ins Initialize and script ActiveX controls not marked as safe and Include local directory path when uploading file to server.');
                    return false;
                }

                if (fileSize > '25600000') {
                    PhotoActivity.GetPhoto();
                    commonNotification.AlertMessage("File exceeds 25MB.");
                    return false;
                }
                // below code is for IE 8 as it fetch the full address of file.
                var indexof = name2.lastIndexOf('\\');
                var fileName = '';
                if (indexof != -1) {
                    name2 = name2.substring(indexof + 1, name2.length)
                }
                var name1 = name2.replace(/ /g, "-");
                var name = name1.replace(/_/g, "-");

                var Time = new Date();
                Time = Time.getHours() + Time.getMinutes() + Time.getSeconds() + "_";
                PhotoActivity.ImagePath = ProjectActivityLog.MainOnwerId + '/' + name;
                PhotoActivity.ImageTitle = $('#edittitleActivity').val();
                PhotoActivity.PhotoImageEditPath = "";
                PhotoActivity.ActivityPhotoId = $('#editid').val();
                if ($('#editcheckbox').is(':checked')) {
                    PhotoActivity.IsProfile = "Yes";
                }
                else {
                    PhotoActivity.IsProfile = "No";
                }
                var ext = '';

                if (PhotoActivity.IsProfile == "No") {
                    ext = name.split('.').pop().toLowerCase();
                    if ($.inArray(ext, ["bmp", "dds", "gif", "jpg", "png", "psd", "pspimage", "tga", "thm", "tif", "tiff", "yuv"]) != -1) {
                        commonNotification.AlertMessage('Invalid Extension!');
                        return false;
                    }
                }
                else {
                    ext = name.split('.').pop().toLowerCase();
                    if ($.inArray(ext, ["doc", "docx", "log", "msg", "odt", "pages", "rtf", "tex", "txt", "wpd", "wps", "xlsx", "pdf", "zip"]) != -1) {
                        commonNotification.AlertMessage('Invalid Extension!');
                        return false;
                    }
                }
                PhotoActivity.SavePhoto();
            }
            else {
                if ($('#editcheckbox').is(':checked')) {
                    PhotoActivity.IsProfile = "Yes";
                }
                else {
                    PhotoActivity.IsProfile = "No";
                }
                PhotoActivity.ActivityPhotoId = $('#editid').val();
                PhotoActivity.ImageTitle = $('#edittitleActivity').val();
                PhotoActivity.ImagePath = "";
                PhotoActivity.PhotoImageEditPath = PhotoActivity.EditPath;
                PhotoActivity.UpdatePhoto();
            }
        }