looks like the Images\Upload directory does not the needed write permissions to allow images to be uploaded.
You may be able to use Dreamweaver to assign the privileges. In the Files List, select Remote View to view the remote server. In the Images folder, Right Click the Upload Folder and select Set Permissions. make sure that the owner is set to Read Write and Execute. Set the User/Group and Everyone to Read and Write.
If you can not do this through Dreamweaver, you may need to use an external FTP program or contact the host for further instructions.